"Hydrogen" : { "symbol" : "H", "atomic_number" : 1, "atomic_weight" : 1.00794, "melting_point K" : 14.01, "boiling_point K" : 20.28, "atomic_radius pm" : 79, "covalent_radius pm" : 32, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 14.1, "fusion_heat (kJ/mol)" : "0.117 (H-H)", "evaporation_heat (kJ/mol)" : "0.904 (H-H)", "pauling_negativity" : 2.20, "first_ionizing kJ/mol" : 1311.3, "lattice_structure" : "HEX", "lattice_constant ang" : 3.750 },
"Helium" : { "symbol" : "He", "atomic_number" : 2, "atomic_weight" : 4.002602, "melting_point K" : 0.95, "boiling_point K" : 4.216, "atomic_radius pm" : 0.0, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 31.8, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 0.08, "pauling_negativity" : "-", "first_ionizing kJ/mol" : 2361.3, "lattice_structure" : "HEX", "lattice_constant ang" : 3.570 },
"Lithium" : { "symbol" : "Li", "atomic_number" : 3, "atomic_weight" : 6.941, "melting_point K" : 553.69, "boiling_point K" : 1118.15, "atomic_radius pm" : 155, "covalent_radius pm" : 163, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 13.1, "fusion_heat (kJ/mol)" : 2.89, "evaporation_heat (kJ/mol)" : 148, "pauling_negativity" : 0.98, "first_ionizing kJ/mol" : 519.9, "lattice_structure" : "BCC", "lattice_constant ang" : 3.490 },
"Beryllium" : { "symbol" : "Be", "atomic_number" : 4, "atomic_weight" : 9.01218, "melting_point K" : 1551, "boiling_point K" : 3243, "atomic_radius pm" : 112, "covalent_radius pm" : 90, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 5.0, "fusion_heat (kJ/mol)" : 12.21, "evaporation_heat (kJ/mol)" : 309, "pauling_negativity" : 1.57, "first_ionizing kJ/mol" : 898.8, "lattice_structure" : "HEX", "lattice_constant ang" : 2.290 },
"Boron" : { "symbol" : "B", "atomic_number" : 5, "atomic_weight" : 10.811, "melting_point K" : 2573, "boiling_point K" : 3931, "atomic_radius pm" : 98, "covalent_radius pm" : 82, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 4.6, "fusion_heat (kJ/mol)" : 23.60, "evaporation_heat (kJ/mol)" : 504.5, "pauling_negativity" : 2.04, "first_ionizing kJ/mol" : 800.2, "lattice_structure" : "TET", "lattice_constant ang" : 8.730 },
"Carbon" : { "symbol" : "C", "atomic_number" : 6, "atomic_weight" : 12.011, "melting_point K" : 3820, "boiling_point K" : 5100, "atomic_radius pm" : 91, "covalent_radius pm" : 77, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 5.3, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 2.55, "first_ionizing kJ/mol" : 1085.7, "lattice_structure" : "DIA", "lattice_constant ang" : 3.570 },
"Nitrogen" : { "symbol" : "N", "atomic_number" : 7, "atomic_weight" : 14.00674, "melting_point K" : 63.29, "boiling_point K" : 77.4, "atomic_radius pm" : 92, "covalent_radius pm" : 75, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 17.3, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 3.04, "first_ionizing kJ/mol" : 1401.5, "lattice_structure" : "HEX", "lattice_constant ang" : 4.039 },
"Oxygen" : { "symbol" : "O", "atomic_number" : 8, "atomic_weight" : 15.9994, "melting_point K" : 54.8, "boiling_point K" : 90.19, "atomic_radius pm" : "-", "covalent_radius pm" : 73, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 14.0, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 3.44, "first_ionizing kJ/mol" : 1313.1, "lattice_structure" : "CUB", "lattice_constant ang" : 6.830 },
"Fluorine" : { "symbol" : "F", "atomic_number" : 9, "atomic_weight" : 18.998403, "melting_point K" : 53.53, "boiling_point K" : 85.01, "atomic_radius pm" : "-", "covalent_radius pm" : 72, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 17.1, "fusion_heat (kJ/mol)" : "0.51 (F-F)", "evaporation_heat (kJ/mol)" : "6.54 (F-F)", "pauling_negativity" : 3.98, "first_ionizing kJ/mol" : 1680.0, "lattice_structure" : "MCL", "lattice_constant ang" : "-" },
"Neon" : { "symbol" : "Ne", "atomic_number" : 10, "atomic_weight" : 20.1797, "melting_point K" : 48, "boiling_point K" : 27.1, "atomic_radius pm" : "-", "covalent_radius pm" : 71, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 16.8, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 1.74, "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 2079.4, "lattice_structure" : "FCC", "lattice_constant ang" : 4.430 },
"Sodium" : { "symbol" : "Na", "atomic_number" : 11, "atomic_weight" : 22.989768, "melting_point K" : 370.96, "boiling_point K" : 1156.1, "atomic_radius pm" : 190, "covalent_radius pm" : 154, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 23.7, "fusion_heat (kJ/mol)" : 2.64, "evaporation_heat (kJ/mol)" : 97.9, "pauling_negativity" : 0.93, "first_ionizing kJ/mol" : 495.6, "lattice_structure" : "BCC", "lattice_constant ang" : 4.230 },
"Magnesium" : { "symbol" : "Mg", "atomic_number" : 12, "atomic_weight" : 24.305, "melting_point K" : 922, "boiling_point K" : 1363, "atomic_radius pm" : 160, "covalent_radius pm" : 136, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 14.0, "fusion_heat (kJ/mol)" : 9.20, "evaporation_heat (kJ/mol)" : 131.8, "pauling_negativity" : 1.31, "first_ionizing kJ/mol" : 737.3, "lattice_structure" : "HEX", "lattice_constant ang" : 3.210 },
"Aluminum" : { "symbol" : "Al", "atomic_number" : 13, "atomic_weight" : 26.981539, "melting_point K" : 933.5, "boiling_point K" : 2740, "atomic_radius pm" : 143, "covalent_radius pm" : 118, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.0, "fusion_heat (kJ/mol)" : 10.75, "evaporation_heat (kJ/mol)" : 284.1, "pauling_negativity" : 1.61, "first_ionizing kJ/mol" : 577.2, "lattice_structure" : "FCC", "lattice_constant ang" : 4.050 },
"Silicon" : { "symbol" : "Si", "atomic_number" : 14, "atomic_weight" : 28.0855, "melting_point K" : 1683, "boiling_point K" : 2628, "atomic_radius pm" : 132, "covalent_radius pm" : 111, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 12.1, "fusion_heat (kJ/mol)" : 50.6, "evaporation_heat (kJ/mol)" : 383, "pauling_negativity" : 1.90, "first_ionizing kJ/mol" : 786.0, "lattice_structure" : "DIA", "lattice_constant ang" : 5.430 },
"Phosphorus" : { "symbol" : "P", "atomic_number" : 15, "atomic_weight" : 30.973762, "melting_point K" : 317.3, "boiling_point K" : 553, "atomic_radius pm" : 128, "covalent_radius pm" : 106, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 17.0, "fusion_heat (kJ/mol)" : 2.51, "evaporation_heat (kJ/mol)" : 49.8, "pauling_negativity" : 2.19, "first_ionizing kJ/mol" : 1011.2, "lattice_structure" : "CUB", "lattice_constant ang" : 7.170 },
"Sulfur" : { "symbol" : "S", "atomic_number" : 16, "atomic_weight" : 32.066, "melting_point K" : 386, "boiling_point K" : 717.824, "atomic_radius pm" : 127, "covalent_radius pm" : 102, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 15.5, "fusion_heat (kJ/mol)" : 1.23, "evaporation_heat (kJ/mol)" : 10.5, "pauling_negativity" : 2.58, "first_ionizing kJ/mol" : 999.0, "lattice_structure" : "ORC", "lattice_constant ang" : 10.470 },
"Chlorine" : { "symbol" : "Cl", "atomic_number" : 17, "atomic_weight" : 35.4527, "melting_point K" : 172.2, "boiling_point K" : 238.6, "atomic_radius pm" : "-", "covalent_radius pm" : 99, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.7, "fusion_heat (kJ/mol)" : "6.41 (Cl-Cl)", "evaporation_heat (kJ/mol)" : "20.41 (Cl-Cl)", "pauling_negativity" : 3.16, "first_ionizing kJ/mol" : 1254.9, "lattice_structure" : "ORC", "lattice_constant ang" : 6.240 },
"Argon" : { "symbol" : "Ar", "atomic_number" : 18, "atomic_weight" : 39.948, "melting_point K" : 83.8, "boiling_point K" : 87.3, "atomic_radius pm" : "2-", "covalent_radius pm" : 98, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 24.2, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 6.52, "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 1519.6, "lattice_structure" : "FCC", "lattice_constant ang" : 5.260 },
"Potassium" : { "symbol" : "K", "atomic_number" : 19, "atomic_weight" : 39.0983, "melting_point K" : 336.8, "boiling_point K" : 1047, "atomic_radius pm" : 235, "covalent_radius pm" : 203, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 45.3, "fusion_heat (kJ/mol)" : 102.5, "evaporation_heat (kJ/mol)" : 2.33, "pauling_negativity" : 0.82, "first_ionizing kJ/mol" : 418.5, "lattice_structure" : "BCC", "lattice_constant ang" : 5.230 },
"Calcium" : { "symbol" : "Ca", "atomic_number" : 20, "atomic_weight" : 40.078, "melting_point K" : 1112, "boiling_point K" : 1757, "atomic_radius pm" : 197, "covalent_radius pm" : 174, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 29.9, "fusion_heat (kJ/mol)" : 9.20, "evaporation_heat (kJ/mol)" : 153.6, "pauling_negativity" : 1.00, "first_ionizing kJ/mol" : 589.4, "lattice_structure" : "FCC", "lattice_constant ang" : 5.580 },
"Scandium" : { "symbol" : "Sc", "atomic_number" : 21, "atomic_weight" : 44.95591, "melting_point K" : 1814, "boiling_point K" : 3104, "atomic_radius pm" : 162, "covalent_radius pm" : 144, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 15.0, "fusion_heat (kJ/mol)" : 15.8, "evaporation_heat (kJ/mol)" : 332.7, "pauling_negativity" : 1.36, "first_ionizing kJ/mol" : 630.8, "lattice_structure" : "HEX", "lattice_constant ang" : 3.310 },
"Titanium" : { "symbol" : "Ti", "atomic_number" : 22, "atomic_weight" : 47.88, "melting_point K" : 1933, "boiling_point K" : 3560, "atomic_radius pm" : 147, "covalent_radius pm" : 132, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.6, "fusion_heat (kJ/mol)" : 18.8, "evaporation_heat (kJ/mol)" : 422.6, "pauling_negativity" : 1.54, "first_ionizing kJ/mol" : 657.8, "lattice_structure" : "HEX", "lattice_constant ang" : 2.950 },
"Vanadium" : { "symbol" : "V", "atomic_number" : 23, "atomic_weight" : 50.9415, "melting_point K" : 2160, "boiling_point K" : 3650, "atomic_radius pm" : 134, "covalent_radius pm" : 122, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.35, "fusion_heat (kJ/mol)" : 17.5, "evaporation_heat (kJ/mol)" : 460, "pauling_negativity" : 1.63, "first_ionizing kJ/mol" : 650.1, "lattice_structure" : "BCC", "lattice_constant ang" : 3.020 },
"Chromium" : { "symbol" : "Cr", "atomic_number" : 24, "atomic_weight" : 51.9961, "melting_point K" : 2130, "boiling_point K" : 2945, "atomic_radius pm" : 130, "covalent_radius pm" : 118, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 7.23, "fusion_heat (kJ/mol)" : 21, "evaporation_heat (kJ/mol)" : 342, "pauling_negativity" : 1.66, "first_ionizing kJ/mol" : 652.4, "lattice_structure" : "BCC", "lattice_constant ang" : 2.880 },
"Manganese" : { "symbol" : "Mn", "atomic_number" : 25, "atomic_weight" : 54.93805, "melting_point K" : 1517, "boiling_point K" : 2235, "atomic_radius pm" : 135, "covalent_radius pm" : 117, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 7.39, "fusion_heat (kJ/mol)" : "(13.4)", "evaporation_heat (kJ/mol)" : 221, "pauling_negativity" : 1.55, "first_ionizing kJ/mol" : 716.8, "lattice_structure" : "CUB", "lattice_constant ang" : 8.890 },
"Iron" : { "symbol" : "Fe", "atomic_number" : 26, "atomic_weight" : 55.847, "melting_point K" : 1808, "boiling_point K" : 3023, "atomic_radius pm" : 126, "covalent_radius pm" : 117, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 7.1, "fusion_heat (kJ/mol)" : 13.8, "evaporation_heat (kJ/mol)" : "~340", "pauling_negativity" : 1.83, "first_ionizing kJ/mol" : 759.1, "lattice_structure" : "BCC", "lattice_constant ang" : 2.870 },
"Cobalt" : { "symbol" : "Co", "atomic_number" : 27, "atomic_weight" : 58.9332, "melting_point K" : 1768, "boiling_point K" : 3143, "atomic_radius pm" : 125, "covalent_radius pm" : 116, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 6.7, "fusion_heat (kJ/mol)" : 15.48, "evaporation_heat (kJ/mol)" : 389.1, "pauling_negativity" : 1.88, "first_ionizing kJ/mol" : 758.1, "lattice_structure" : "HEX", "lattice_constant ang" : 2.510 },
"Nickel" : { "symbol" : "Ni", "atomic_number" : 28, "atomic_weight" : 58.6934, "melting_point K" : 1726, "boiling_point K" : 3005, "atomic_radius pm" : 124, "covalent_radius pm" : 115, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 6.6, "fusion_heat (kJ/mol)" : 17.61, "evaporation_heat (kJ/mol)" : 378.6, "pauling_negativity" : 1.91, "first_ionizing kJ/mol" : 736.2, "lattice_structure" : "FCC", "lattice_constant ang" : 3.520 },
"Copper" : { "symbol" : "Cu", "atomic_number" : 29, "atomic_weight" : 63.546, "melting_point K" : 1356.6, "boiling_point K" : 2840, "atomic_radius pm" : 128, "covalent_radius pm" : 117, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 7.1, "fusion_heat (kJ/mol)" : 13.01, "evaporation_heat (kJ/mol)" : 304.6, "pauling_negativity" : 1.90, "first_ionizing kJ/mol" : 745.0, "lattice_structure" : "FCC", "lattice_constant ang" : 3.610 },
"Zinc" : { "symbol" : "Zn", "atomic_number" : 30, "atomic_weight" : 65.39, "melting_point K" : 692.73, "boiling_point K" : 1180, "atomic_radius pm" : 138, "covalent_radius pm" : 125, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 9.2, "fusion_heat (kJ/mol)" : 7.28, "evaporation_heat (kJ/mol)" : 114.8, "pauling_negativity" : 1.65, "first_ionizing kJ/mol" : 905.8, "lattice_structure" : "HEX", "lattice_constant ang" : 2.660 },
"Gallium" : { "symbol" : "Ga", "atomic_number" : 31, "atomic_weight" : 69.723, "melting_point K" : 302.93, "boiling_point K" : 2676, "atomic_radius pm" : 141, "covalent_radius pm" : 126, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 11.8, "fusion_heat (kJ/mol)" : 5.59, "evaporation_heat (kJ/mol)" : 270.3, "pauling_negativity" : 1.81, "first_ionizing kJ/mol" : 578.7, "lattice_structure" : "ORC", "lattice_constant ang" : 4.510 },
"Germanium" : { "symbol" : "Ge", "atomic_number" : 32, "atomic_weight" : 72.61, "melting_point K" : 1210.6, "boiling_point K" : 3103, "atomic_radius pm" : 137, "covalent_radius pm" : 122, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 13.6, "fusion_heat (kJ/mol)" : 36.8, "evaporation_heat (kJ/mol)" : 328, "pauling_negativity" : 2.01, "first_ionizing kJ/mol" : 760.0, "lattice_structure" : "DIA", "lattice_constant ang" : 5.660 },
"Arsenic" : { "symbol" : "As", "atomic_number" : 33, "atomic_weight" : 74.92159, "melting_point K" : 1090, "boiling_point K" : 876, "atomic_radius pm" : 139, "covalent_radius pm" : 120, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 13.1, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 32.4, "pauling_negativity" : 2.18, "first_ionizing kJ/mol" : 946.2, "lattice_structure" : "RHL", "lattice_constant ang" : 4.130 },
"Selenium" : { "symbol" : "Se", "atomic_number" : 34, "atomic_weight" : 78.96, "melting_point K" : 490, "boiling_point K" : 958.1, "atomic_radius pm" : 140, "covalent_radius pm" : 116, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 16.5, "fusion_heat (kJ/mol)" : 5.23, "evaporation_heat (kJ/mol)" : 59.7, "pauling_negativity" : 2.55, "first_ionizing kJ/mol" : 940.4, "lattice_structure" : "HEX", "lattice_constant ang" : 4.360 },
"Bromine" : { "symbol" : "Br", "atomic_number" : 35, "atomic_weight" : 79.904, "melting_point K" : 265.9, "boiling_point K" : 331.9, "atomic_radius pm" : "-", "covalent_radius pm" : 114, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 23.5, "fusion_heat (kJ/mol)" : "10.57 (Br-Br)", "evaporation_heat (kJ/mol)" : "29.56 (Br-Br)", "pauling_negativity" : 2.96, "first_ionizing kJ/mol" : 1142.0, "lattice_structure" : "ORC", "lattice_constant ang" : 6.670 },
"Krypton" : { "symbol" : "Kr", "atomic_number" : 36, "atomic_weight" : 83.8, "melting_point K" : 116.6, "boiling_point K" : 120.85, "atomic_radius pm" : "-", "covalent_radius pm" : 112, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 32.2, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 9.05, "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 1350.0, "lattice_structure" : "FCC", "lattice_constant ang" : 5.720 },
"Rubidium" : { "symbol" : "Rb", "atomic_number" : 37, "atomic_weight" : 85.4678, "melting_point K" : 312.2, "boiling_point K" : 961, "atomic_radius pm" : 248, "covalent_radius pm" : 216, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 55.9, "fusion_heat (kJ/mol)" : 2.20, "evaporation_heat (kJ/mol)" : 75.8, "pauling_negativity" : 0.82, "first_ionizing kJ/mol" : 402.8, "lattice_structure" : "BCC", "lattice_constant ang" : 5.590 },
"Strontium" : { "symbol" : "Sr", "atomic_number" : 38, "atomic_weight" : 87.62, "melting_point K" : 1042, "boiling_point K" : 1657, "atomic_radius pm" : 215, "covalent_radius pm" : 191, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 33.7, "fusion_heat (kJ/mol)" : 9.20, "evaporation_heat (kJ/mol)" : 144, "pauling_negativity" : 0.95, "first_ionizing kJ/mol" : 549.0, "lattice_structure" : "FCC", "lattice_constant ang" : 6.080 },
"Yttrium" : { "symbol" : "Y", "atomic_number" : 39, "atomic_weight" : 88.90585, "melting_point K" : 1795, "boiling_point K" : 3611, "atomic_radius pm" : 178, "covalent_radius pm" : 162, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.8, "fusion_heat (kJ/mol)" : 11.5, "evaporation_heat (kJ/mol)" : 367, "pauling_negativity" : 1.22, "first_ionizing kJ/mol" : 615.4, "lattice_structure" : "HEX", "lattice_constant ang" : 3.650 },
"Zirconium" : { "symbol" : "Zr", "atomic_number" : 40, "atomic_weight" : 91.224, "melting_point K" : 2125, "boiling_point K" : 4650, "atomic_radius pm" : 160, "covalent_radius pm" : 145, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 14.1, "fusion_heat (kJ/mol)" : 19.2, "evaporation_heat (kJ/mol)" : 567, "pauling_negativity" : 1.33, "first_ionizing kJ/mol" : 659.7, "lattice_structure" : "HEX", "lattice_constant ang" : 3.230 },
"Niobium" : { "symbol" : "Nb", "atomic_number" : 41, "atomic_weight" : 92.90638, "melting_point K" : 2741, "boiling_point K" : 5015, "atomic_radius pm" : 146, "covalent_radius pm" : 134, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.8, "fusion_heat (kJ/mol)" : 26.8, "evaporation_heat (kJ/mol)" : 680, "pauling_negativity" : 1.6, "first_ionizing kJ/mol" : 663.6, "lattice_structure" : "BCC", "lattice_constant ang" : 3.300 },
"Molybdenum" : { "symbol" : "Mo", "atomic_number" : 42, "atomic_weight" : 95.94, "melting_point K" : 2890, "boiling_point K" : 4885, "atomic_radius pm" : 139, "covalent_radius pm" : 130, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 9.4, "fusion_heat (kJ/mol)" : 28, "evaporation_heat (kJ/mol)" : "~590", "pauling_negativity" : 2.16, "first_ionizing kJ/mol" : 684.8, "lattice_structure" : "BCC", "lattice_constant ang" : 3.150 },
"Technetium" : { "symbol" : "Tc", "atomic_number" : 43, "atomic_weight" : 97.9072, "melting_point K" : 2445, "boiling_point K" : 5150, "atomic_radius pm" : 136, "covalent_radius pm" : 127, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.5, "fusion_heat (kJ/mol)" : 23.8, "evaporation_heat (kJ/mol)" : 585, "pauling_negativity" : 1.9, "first_ionizing kJ/mol" : 702.2, "lattice_structure" : "HEX", "lattice_constant ang" : 2.740 },
"Ruthenium" : { "symbol" : "Ru", "atomic_number" : 44, "atomic_weight" : 101.07, "melting_point K" : 2583, "boiling_point K" : 4173, "atomic_radius pm" : 134, "covalent_radius pm" : 125, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.3, "fusion_heat (kJ/mol)" : "(25.5)", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 2.2, "first_ionizing kJ/mol" : 710.3, "lattice_structure" : "HEX", "lattice_constant ang" : 2.700 },
"Rhodium" : { "symbol" : "Rh", "atomic_number" : 45, "atomic_weight" : 102.9055, "melting_point K" : 2239, "boiling_point K" : 4000, "atomic_radius pm" : 134, "covalent_radius pm" : 125, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.3, "fusion_heat (kJ/mol)" : 21.8, "evaporation_heat (kJ/mol)" : 494, "pauling_negativity" : 2.28, "first_ionizing kJ/mol" : 719.5, "lattice_structure" : "FCC", "lattice_constant ang" : 3.800 },
"Palladium" : { "symbol" : "Pd", "atomic_number" : 46, "atomic_weight" : 106.42, "melting_point K" : 1825, "boiling_point K" : 3413, "atomic_radius pm" : 137, "covalent_radius pm" : 128, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.9, "fusion_heat (kJ/mol)" : 17.24, "evaporation_heat (kJ/mol)" : 372.4, "pauling_negativity" : 2.20, "first_ionizing kJ/mol" : 803.5, "lattice_structure" : "FCC", "lattice_constant ang" : 3.890 },
"Silver" : { "symbol" : "Ag", "atomic_number" : 47, "atomic_weight" : 107.8682, "melting_point K" : 1235.1, "boiling_point K" : 2485, "atomic_radius pm" : 144, "covalent_radius pm" : 134, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.3, "fusion_heat (kJ/mol)" : 11.95, "evaporation_heat (kJ/mol)" : 254.1, "pauling_negativity" : 1.93, "first_ionizing kJ/mol" : 730.5, "lattice_structure" : "FCC", "lattice_constant ang" : 4.090 },
"Cadmium" : { "symbol" : "Cd", "atomic_number" : 48, "atomic_weight" : 112.411, "melting_point K" : 594.1, "boiling_point K" : 1038, "atomic_radius pm" : 154, "covalent_radius pm" : 148, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 13.1, "fusion_heat (kJ/mol)" : 6.11, "evaporation_heat (kJ/mol)" : 59.1, "pauling_negativity" : 1.69, "first_ionizing kJ/mol" : 867.2, "lattice_structure" : "HEX", "lattice_constant ang" : 2.980 },
"Indium" : { "symbol" : "In", "atomic_number" : 49, "atomic_weight" : 114.818, "melting_point K" : 429.32, "boiling_point K" : 2353, "atomic_radius pm" : 166, "covalent_radius pm" : 144, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 15.7, "fusion_heat (kJ/mol)" : 3.24, "evaporation_heat (kJ/mol)" : 225.1, "pauling_negativity" : 1.78, "first_ionizing kJ/mol" : 558.0, "lattice_structure" : "TET", "lattice_constant ang" : 4.590 },
"Tin" : { "symbol" : "Sn", "atomic_number" : 50, "atomic_weight" : 118.71, "melting_point K" : 505.1, "boiling_point K" : 2543, "atomic_radius pm" : 162, "covalent_radius pm" : 141, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 16.3, "fusion_heat (kJ/mol)" : 7.07, "evaporation_heat (kJ/mol)" : 296, "pauling_negativity" : 1.96, "first_ionizing kJ/mol" : 708.2, "lattice_structure" : "TET", "lattice_constant ang" : 5.820 },
"Antimony" : { "symbol" : "Sb", "atomic_number" : 51, "atomic_weight" : 121.760, "melting_point K" : 903.9, "boiling_point K" : 1908, "atomic_radius pm" : 159, "covalent_radius pm" : 140, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.4, "fusion_heat (kJ/mol)" : 20.08, "evaporation_heat (kJ/mol)" : 195.2, "pauling_negativity" : 2.05, "first_ionizing kJ/mol" : 833.3, "lattice_structure" : "RHL", "lattice_constant ang" : 4.510 },
"Tellurium" : { "symbol" : "Te", "atomic_number" : 52, "atomic_weight" : 127.6, "melting_point K" : 722.7, "boiling_point K" : 1263, "atomic_radius pm" : 160, "covalent_radius pm" : 136, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 20.5, "fusion_heat (kJ/mol)" : 17.91, "evaporation_heat (kJ/mol)" : 49.8, "pauling_negativity" : 2.1, "first_ionizing kJ/mol" : 869.0, "lattice_structure" : "HEX", "lattice_constant ang" : 4.450 },
"Iodine" : { "symbol" : "I", "atomic_number" : 53, "atomic_weight" : 126.90447, "melting_point K" : 386.7, "boiling_point K" : 457.5, "atomic_radius pm" : "-", "covalent_radius pm" : 133, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 25.7, "fusion_heat (kJ/mol)" : "15.52 (I-I)", "evaporation_heat (kJ/mol)" : "41.95 (I-I)", "pauling_negativity" : 2.66, "first_ionizing kJ/mol" : 1008.3, "lattice_structure" : "ORC", "lattice_constant ang" : 7.720 },
"Xenon" : { "symbol" : "Xe", "atomic_number" : 54, "atomic_weight" : 131.29, "melting_point K" : 161.3, "boiling_point K" : 166.1, "atomic_radius pm" : "-", "covalent_radius pm" : 131, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 42.9, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 12.65, "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 1170.0, "lattice_structure" : "FCC", "lattice_constant ang" : 6.200 },
"Cesium" : { "symbol" : "Cs", "atomic_number" : 55, "atomic_weight" : 132.90543, "melting_point K" : 301.6, "boiling_point K" : 951.6, "atomic_radius pm" : 267, "covalent_radius pm" : 235, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 70.0, "fusion_heat (kJ/mol)" : 2.09, "evaporation_heat (kJ/mol)" : 68.3, "pauling_negativity" : 0.79, "first_ionizing kJ/mol" : 375.5, "lattice_structure" : "BCC", "lattice_constant ang" : 6.050 },
"Barium" : { "symbol" : "Ba", "atomic_number" : 56, "atomic_weight" : 137.327, "melting_point K" : 1002, "boiling_point K" : 1910, "atomic_radius pm" : 222, "covalent_radius pm" : 198, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 39.0, "fusion_heat (kJ/mol)" : 7.66, "evaporation_heat (kJ/mol)" : 142.0, "pauling_negativity" : 0.89, "first_ionizing kJ/mol" : 502.5, "lattice_structure" : "BCC", "lattice_constant ang" : 5.020 },
"Lanthanum" : { "symbol" : "La", "atomic_number" : 57, "atomic_weight" : 138.9055, "melting_point K" : 1194, "boiling_point K" : 3730, "atomic_radius pm" : 187, "covalent_radius pm" : 169, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 22.5, "fusion_heat (kJ/mol)" : 8.5, "evaporation_heat (kJ/mol)" : 402, "pauling_negativity" : 1.10, "first_ionizing kJ/mol" : 541.1, "lattice_structure" : "HEX", "lattice_constant ang" : 3.750 },
"Cerium" : { "symbol" : "Ce", "atomic_number" : 58, "atomic_weight" : 140.115, "melting_point K" : 1072, "boiling_point K" : 3699, "atomic_radius pm" : 181, "covalent_radius pm" : 165, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 21.0, "fusion_heat (kJ/mol)" : 5.2, "evaporation_heat (kJ/mol)" : 398, "pauling_negativity" : 1.12, "first_ionizing kJ/mol" : 540.1, "lattice_structure" : "FCC", "lattice_constant ang" : 5.160 },
"Praseodymium" : { "symbol" : "Pr", "atomic_number" : 59, "atomic_weight" : 140.90765, "melting_point K" : 1204, "boiling_point K" : 3785, "atomic_radius pm" : 182, "covalent_radius pm" : 165, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 20.8, "fusion_heat (kJ/mol)" : 11.3, "evaporation_heat (kJ/mol)" : 331, "pauling_negativity" : 1.13, "first_ionizing kJ/mol" : 526.6, "lattice_structure" : "HEX", "lattice_constant ang" : 3.670 },
"Neodymium" : { "symbol" : "Nd", "atomic_number" : 60, "atomic_weight" : 144.24, "melting_point K" : 1294, "boiling_point K" : 3341, "atomic_radius pm" : 182, "covalent_radius pm" : 184, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 20.6, "fusion_heat (kJ/mol)" : 7.1, "evaporation_heat (kJ/mol)" : 289, "pauling_negativity" : 1.14, "first_ionizing kJ/mol" : 531.5, "lattice_structure" : "HEX", "lattice_constant ang" : 3.660 },
"Promethium" : { "symbol" : "Pm", "atomic_number" : 61, "atomic_weight" : 144.9127, "melting_point K" : 1441, "boiling_point K" : 3000, "atomic_radius pm" : "-", "covalent_radius pm" : 163, "ionic_radius pm" : "", "atomic_volume cm3/mol" : "-", "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 536, "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Samarium" : { "symbol" : "Sm", "atomic_number" : 62, "atomic_weight" : 150.36, "melting_point K" : 1350, "boiling_point K" : 2064, "atomic_radius pm" : 181, "covalent_radius pm" : 162, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.9, "fusion_heat (kJ/mol)" : 8.9, "evaporation_heat (kJ/mol)" : 165, "pauling_negativity" : 1.17, "first_ionizing kJ/mol" : 540.1, "lattice_structure" : "RHL", "lattice_constant ang" : 9.000 },
"Europium" : { "symbol" : "Eu", "atomic_number" : 63, "atomic_weight" : 151.965, "melting_point K" : 1095, "boiling_point K" : 1870, "atomic_radius pm" : 199, "covalent_radius pm" : 185, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 28.9, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 176, "pauling_negativity" : 0.0, "first_ionizing kJ/mol" : 546.9, "lattice_structure" : "BCC", "lattice_constant ang" : 4.610 },
"Gadolinium" : { "symbol" : "Gd", "atomic_number" : 64, "atomic_weight" : 157.25, "melting_point K" : 1586, "boiling_point K" : 3539, "atomic_radius pm" : 179, "covalent_radius pm" : 161, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.9, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 398, "pauling_negativity" : 1.20, "first_ionizing kJ/mol" : 594.2, "lattice_structure" : "HEX", "lattice_constant ang" : 3.640 },
"Terbium" : { "symbol" : "Tb", "atomic_number" : 65, "atomic_weight" : 158.92534, "melting_point K" : 1629, "boiling_point K" : 3296, "atomic_radius pm" : 180, "covalent_radius pm" : 159, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.2, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 389, "pauling_negativity" : 1.2, "first_ionizing kJ/mol" : 569, "lattice_structure" : "HEX", "lattice_constant ang" : 3.600 },
"Dysprosium" : { "symbol" : "Dy", "atomic_number" : 66, "atomic_weight" : 162.50, "melting_point K" : 1685, "boiling_point K" : 2835, "atomic_radius pm" : 180, "covalent_radius pm" : 159, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.0, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 291, "pauling_negativity" : "-", "first_ionizing kJ/mol" : 567, "lattice_structure" : "HEX", "lattice_constant ang" : 3.590 },
"Holmium" : { "symbol" : "Ho", "atomic_number" : 67, "atomic_weight" : 164.93032, "melting_point K" : 1747, "boiling_point K" : 2968, "atomic_radius pm" : 179, "covalent_radius pm" : 158, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.7, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 301, "pauling_negativity" : 1.23, "first_ionizing kJ/mol" : 574, "lattice_structure" : "HEX", "lattice_constant ang" : 3.580 },
"Erbium" : { "symbol" : "Er", "atomic_number" : 68, "atomic_weight" : 167.26, "melting_point K" : 1802, "boiling_point K" : 3136, "atomic_radius pm" : 178, "covalent_radius pm" : 157, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.4, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 317, "pauling_negativity" : 1.24, "first_ionizing kJ/mol" : 581, "lattice_structure" : "HEX", "lattice_constant ang" : 3.560 },
"Thulium" : { "symbol" : "Tm", "atomic_number" : 69, "atomic_weight" : 168.93421, "melting_point K" : 1818, "boiling_point K" : 2220, "atomic_radius pm" : 177, "covalent_radius pm" : 156, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.1, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 232, "pauling_negativity" : 1.25, "first_ionizing kJ/mol" : 589, "lattice_structure" : "HEX", "lattice_constant ang" : 3.540 },
"Ytterbium" : { "symbol" : "Yb", "atomic_number" : 70, "atomic_weight" : 173.04, "melting_point K" : 1097, "boiling_point K" : 1466, "atomic_radius pm" : 194, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 24.8, "fusion_heat (kJ/mol)" : 3.35, "evaporation_heat (kJ/mol)" : 159, "pauling_negativity" : 1.1, "first_ionizing kJ/mol" : 603, "lattice_structure" : "FCC", "lattice_constant ang" : 5.490 },
"Lutetium" : { "symbol" : "Lu", "atomic_number" : 71, "atomic_weight" : 174.967, "melting_point K" : 1936, "boiling_point K" : 3668, "atomic_radius pm" : 175, "covalent_radius pm" : 156, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 17.8, "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 414, "pauling_negativity" : 1.27, "first_ionizing kJ/mol" : 513, "lattice_structure" : "HEX", "lattice_constant ang" : 3.510 },
"Hafnium" : { "symbol" : "Hf", "atomic_number" : 72, "atomic_weight" : 178.49, "melting_point K" : 2503, "boiling_point K" : 5470, "atomic_radius pm" : 167, "covalent_radius pm" : 144, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 13.6, "fusion_heat (kJ/mol)" : "(25.1)", "evaporation_heat (kJ/mol)" : 575, "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : 575.2, "lattice_structure" : "HEX", "lattice_constant ang" : 3.200 },
"Tantalum" : { "symbol" : "Ta", "atomic_number" : 73, "atomic_weight" : 180.9479, "melting_point K" : 3269, "boiling_point K" : 5698, "atomic_radius pm" : 149, "covalent_radius pm" : 134, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.9, "fusion_heat (kJ/mol)" : 24.7, "evaporation_heat (kJ/mol)" : 758, "pauling_negativity" : 1.5, "first_ionizing kJ/mol" : 760.1, "lattice_structure" : "BCC", "lattice_constant ang" : 3.310 },
"Tungsten" : { "symbol" : "W", "atomic_number" : 74, "atomic_weight" : 183.84, "melting_point K" : 3680, "boiling_point K" : 5930, "atomic_radius pm" : 141, "covalent_radius pm" : 130, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 9.53, "fusion_heat (kJ/mol)" : "(35)", "evaporation_heat (kJ/mol)" : 824, "pauling_negativity" : 1.7, "first_ionizing kJ/mol" : 769.7, "lattice_structure" : "BCC", "lattice_constant ang" : 3.160 },
"Rhenium" : { "symbol" : "Re", "atomic_number" : 75, "atomic_weight" : 186.207, "melting_point K" : 3453, "boiling_point K" : 5900, "atomic_radius pm" : 137, "covalent_radius pm" : 128, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.85, "fusion_heat (kJ/mol)" : 34, "evaporation_heat (kJ/mol)" : 704, "pauling_negativity" : 1.9, "first_ionizing kJ/mol" : 759.1, "lattice_structure" : "HEX", "lattice_constant ang" : 2.760 },
"Osmium" : { "symbol" : "Os", "atomic_number" : 76, "atomic_weight" : 190.23, "melting_point K" : 3327, "boiling_point K" : 5300, "atomic_radius pm" : 135, "covalent_radius pm" : 126, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.43, "fusion_heat (kJ/mol)" : 31.7, "evaporation_heat (kJ/mol)" : 738, "pauling_negativity" : 2.2, "first_ionizing kJ/mol" : 819.8, "lattice_structure" : "HEX", "lattice_constant ang" : 2.740 },
"Iridium" : { "symbol" : "Ir", "atomic_number" : 77, "atomic_weight" : 192.22, "melting_point K" : 2683, "boiling_point K" : 4403, "atomic_radius pm" : 136, "covalent_radius pm" : 127, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 8.54, "fusion_heat (kJ/mol)" : 27.61, "evaporation_heat (kJ/mol)" : 604, "pauling_negativity" : 2.20, "first_ionizing kJ/mol" : 868.1, "lattice_structure" : "FCC", "lattice_constant ang" : 3.840 },
"Platinum" : { "symbol" : "Pt", "atomic_number" : 78, "atomic_weight" : 195.08, "melting_point K" : 2045, "boiling_point K" : 4100, "atomic_radius pm" : 139, "covalent_radius pm" : 130, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 9.10, "fusion_heat (kJ/mol)" : 21.76, "evaporation_heat (kJ/mol)" : "~470", "pauling_negativity" : 2.28, "first_ionizing kJ/mol" : 868.1, "lattice_structure" : "FCC", "lattice_constant ang" : 3.920 },
"Gold" : { "symbol" : "Au", "atomic_number" : 79, "atomic_weight" : 196.96654, "melting_point K" : 1337.58, "boiling_point K" : 3080, "atomic_radius pm" : 146, "covalent_radius pm" : 134, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 10.2, "fusion_heat (kJ/mol)" : 12.68, "evaporation_heat (kJ/mol)" : "~340", "pauling_negativity" : 2.54, "first_ionizing kJ/mol" : 889.3, "lattice_structure" : "FCC", "lattice_constant ang" : 4.080 },
"Mercury" : { "symbol" : "Hg", "atomic_number" : 80, "atomic_weight" : 200.59, "melting_point K" : 234.28, "boiling_point K" : 629.73, "atomic_radius pm" : 157, "covalent_radius pm" : 149, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 14.8, "fusion_heat (kJ/mol)" : 2.295, "evaporation_heat (kJ/mol)" : 58.5, "pauling_negativity" : 2.00, "first_ionizing kJ/mol" : 1006.0, "lattice_structure" : "RHL", "lattice_constant ang" : 2.990 },
"Thallium" : { "symbol" : "Tl", "atomic_number" : 81, "atomic_weight" : 204.3833, "melting_point K" : 576.6, "boiling_point K" : 1730, "atomic_radius pm" : 171, "covalent_radius pm" : 148, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 17.2, "fusion_heat (kJ/mol)" : 4.31, "evaporation_heat (kJ/mol)" : 162.4, "pauling_negativity" : 1.62, "first_ionizing kJ/mol" : 588.9, "lattice_structure" : "HEX", "lattice_constant ang" : 3.460 },
"Lead" : { "symbol" : "Pb", "atomic_number" : 82, "atomic_weight" : 207.2, "melting_point K" : 600.65, "boiling_point K" : 2013, "atomic_radius pm" : 175, "covalent_radius pm" : 147, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.3, "fusion_heat (kJ/mol)" : 4.77, "evaporation_heat (kJ/mol)" : 177.8, "pauling_negativity" : 1.8, "first_ionizing kJ/mol" : 715.2, "lattice_structure" : "FCC", "lattice_constant ang" : 4.950 },
"Bismuth" : { "symbol" : "Bi", "atomic_number" : 83, "atomic_weight" : 208.98037, "melting_point K" : 544.5, "boiling_point K" : 1883, "atomic_radius pm" : 170, "covalent_radius pm" : 146, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 21.3, "fusion_heat (kJ/mol)" : 11.00, "evaporation_heat (kJ/mol)" : 172.0, "pauling_negativity" : 2.02, "first_ionizing kJ/mol" : 702.9, "lattice_structure" : "RHL", "lattice_constant ang" : 4.750 },
"Polonium" : { "symbol" : "Po", "atomic_number" : 84, "atomic_weight" : 208.9824, "melting_point K" : 527, "boiling_point K" : 1235, "atomic_radius pm" : 176, "covalent_radius pm" : 146, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 22.7, "fusion_heat (kJ/mol)" : "(10)", "evaporation_heat (kJ/mol)" : "(102.9)", "pauling_negativity" : 2.0, "first_ionizing kJ/mol" : 813.1, "lattice_structure" : "SC", "lattice_constant ang" : 3.350 },
"Astatine" : { "symbol" : "At", "atomic_number" : 85, "atomic_weight" : 209.9871, "melting_point K" : 575, "boiling_point K" : 610, "atomic_radius pm" : "-", "covalent_radius pm" : "(145)", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "-", "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 2.2, "first_ionizing kJ/mol" : 916.3, "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Radon" : { "symbol" : "Rn", "atomic_number" : 86, "atomic_weight" : 222.0176, "melting_point K" : 202, "boiling_point K" : 211.4, "atomic_radius pm" : "-", "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "-", "fusion_heat (kJ/mol)" : "-", "evaporation_heat (kJ/mol)" : 18.1, "pauling_negativity" : "-", "first_ionizing kJ/mol" : 1036.5, "lattice_structure" : "FCC", "lattice_constant ang" : "n/a" },
"Francium" : { "symbol" : "Fr", "atomic_number" : 87, "atomic_weight" : 223.0197, "melting_point K" : 300, "boiling_point K" : 950, "atomic_radius pm" : "-", "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "-", "fusion_heat (kJ/mol)" : 15, "evaporation_heat (kJ/mol)" : "-", "pauling_negativity" : 0.7, "first_ionizing kJ/mol" : "~375", "lattice_structure" : "BCC", "lattice_constant ang" : "n/a" },
"Radium" : { "symbol" : "Ra", "atomic_number" : 88, "atomic_weight" : 226.0254, "melting_point K" : 973, "boiling_point K" : 1413, "atomic_radius pm" : "-", "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 45.0, "fusion_heat (kJ/mol)" : "(9.6)", "evaporation_heat (kJ/mol)" : "(113)", "pauling_negativity" : 0.9, "first_ionizing kJ/mol" : 509.0, "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Actinium" : { "symbol" : "Ac", "atomic_number" : 89, "atomic_weight" : 227.0278, "melting_point K" : 1320, "boiling_point K" : 3470, "atomic_radius pm" : 188, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 22.54, "fusion_heat (kJ/mol)" : "(10.5)", "evaporation_heat (kJ/mol)" : "(292.9)", "pauling_negativity" : 1.1, "first_ionizing kJ/mol" : 665.5, "lattice_structure" : "FCC", "lattice_constant ang" : 5.310 },
"Thorium" : { "symbol" : "Th", "atomic_number" : 90, "atomic_weight" : 232.0381, "melting_point K" : 2028, "boiling_point K" : 5060, "atomic_radius pm" : 180, "covalent_radius pm" : 165, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 19.8, "fusion_heat (kJ/mol)" : 16.11, "evaporation_heat (kJ/mol)" : 513.7, "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : 670.4, "lattice_structure" : "FCC", "lattice_constant ang" : 5.080 },
"Protactinium" : { "symbol" : "Pa", "atomic_number" : 91, "atomic_weight" : 231.03588, "melting_point K" : 2113, "boiling_point K" : 4300, "atomic_radius pm" : 161, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 15.0, "fusion_heat (kJ/mol)" : 16.7, "evaporation_heat (kJ/mol)" : 481.2, "pauling_negativity" : 1.5, "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "TET", "lattice_constant ang" : 3.920 },
"Uranium" : { "symbol" : "U", "atomic_number" : 92, "atomic_weight" : 238.0289, "melting_point K" : 1405.5, "boiling_point K" : 4018, "atomic_radius pm" : 138, "covalent_radius pm" : 142, "ionic_radius pm" : "", "atomic_volume cm3/mol" : 12.5, "fusion_heat (kJ/mol)" : 12.6, "evaporation_heat (kJ/mol)" : 417, "pauling_negativity" : 1.38, "first_ionizing kJ/mol" : 686.4, "lattice_structure" : "ORC", "lattice_constant ang" : 2.850 },
"Neptunium" : { "symbol" : "Np", "atomic_number" : 93, "atomic_weight" : 237.048, "melting_point K" : 913, "boiling_point K" : 4175, "atomic_radius pm" : 130, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 21.1, "fusion_heat (kJ/mol)" : "(9.6)", "evaporation_heat (kJ/mol)" : 336, "pauling_negativity" : 1.36, "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "ORC", "lattice_constant ang" : 4.720 },
"Plutonium" : { "symbol" : "Pu", "atomic_number" : 94, "atomic_weight" : 244.0642, "melting_point K" : 914, "boiling_point K" : 3505, "atomic_radius pm" : 151, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "-", "fusion_heat (kJ/mol)" : 2.8, "evaporation_heat (kJ/mol)" : 343.5, "pauling_negativity" : 1.28, "first_ionizing kJ/mol" : 491.9, "lattice_structure" : "MCL", "lattice_constant ang" : "n/a" },
"Americium" : { "symbol" : "Am", "atomic_number" : 95, "atomic_weight" : 243.0614, "melting_point K" : 1267, "boiling_point K" : 2880, "atomic_radius pm" : 173, "covalent_radius pm" : "-", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 20.8, "fusion_heat (kJ/mol)" : "(10.0)", "evaporation_heat (kJ/mol)" : 238.5, "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Curium" : { "symbol" : "Cm", "atomic_number" : 96, "atomic_weight" : 247.0703, "melting_point K" : 1340, "boiling_point K" : "n/a", "atomic_radius pm" : 299, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : 18.28, "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(580)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/A" },
"Berkelium" : { "symbol" : "Bk", "atomic_number" : 97, "atomic_weight" : 247.0703, "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : 297, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(600)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Californium" : { "symbol" : "Cf", "atomic_number" : 98, "atomic_weight" : 251.0796, "melting_point K" : 900, "boiling_point K" : "n/a", "atomic_radius pm" : 295, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(610)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Einsteinium" : { "symbol" : "Es", "atomic_number" : 99, "atomic_weight" : 252.083, "melting_point K" : "n/a", "boiling_point K" : 1130, "atomic_radius pm" : 292, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(620)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Fermium" : { "symbol" : "Fm", "atomic_number" : 100, "atomic_weight" : 257.0951, "melting_point K" : 1800, "boiling_point K" : "n/a", "atomic_radius pm" : 290, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(630)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Mendelevium" : { "symbol" : "Md", "atomic_number" : 101, "atomic_weight" : 258.1, "melting_point K" : 1100, "boiling_point K" : "n/a", "atomic_radius pm" : 287, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(635)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Nobelium" : { "symbol" : "No", "atomic_number" : 102, "atomic_weight" : 259.1009, "melting_point K" : 1100, "boiling_point K" : "n/a", "atomic_radius pm" : 285, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : 1.3, "first_ionizing kJ/mol" : "(640)", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Lawrencium" : { "symbol" : "Lr", "atomic_number" : 103, "atomic_weight" : 262.11, "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : 282, "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Rutherfordium" : { "symbol" : "Rf", "atomic_number" : 104, "atomic_weight" : "[261]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Dubnium" : { "symbol" : "Db", "atomic_number" : 105, "atomic_weight" : "[262]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Seaborgium" : { "symbol" : "Sg", "atomic_number" : 106, "atomic_weight" : "[266]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Bohrium" : { "symbol" : "Bh", "atomic_number" : 107, "atomic_weight" : "[264]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Hassium" : { "symbol" : "Hs", "atomic_number" : 108, "atomic_weight" : "[269]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Meitnerium" : { "symbol" : "Mt", "atomic_number" : 109, "atomic_weight" : "[268]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununnilium" : { "symbol" : "Uun", "atomic_number" : 110, "atomic_weight" : "[269]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Unununium" : { "symbol" : "Uuu", "atomic_number" : 111, "atomic_weight" : "[272]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununbium" : { "symbol" : "Uub", "atomic_number" : 112, "atomic_weight" : "[277]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununtrium" : { "symbol" : "Uut", "atomic_number" : 113, "atomic_weight" : "n/a", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununquadium" : { "symbol" : "Uuq", "atomic_number" : 114, "atomic_weight" : "[289]", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununpentium" : { "symbol" : "Uup", "atomic_number" : 115, "atomic_weight" : "n/a", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununhexium" : { "symbol" : "Uuh", "atomic_number" : 116, "atomic_weight" : "n/a", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununseptium" : { "symbol" : "Uus", "atomic_number" : 117, "atomic_weight" : "n/a", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" },
"Ununoctium" : { "symbol" : "Uuo", "atomic_number" : 118, "atomic_weight" : "n/a", "melting_point K" : "n/a", "boiling_point K" : "n/a", "atomic_radius pm" : "n/a", "covalent_radius pm" : "n/a", "ionic_radius pm" : "", "atomic_volume cm3/mol" : "n/a", "fusion_heat (kJ/mol)" : "n/a", "evaporation_heat (kJ/mol)" : "n/a", "pauling_negativity" : "n/a", "first_ionizing kJ/mol" : "n/a", "lattice_structure" : "n/a", "lattice_constant ang" : "n/a" }