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[ { "Name": "Hydrogen", "Symbol": "H", "Appearance": "colorless gas", "AtomicWeight": 1.00784, "AtomicNumber": 1, "Group": 1, "Period": 1, "Block": "s-block", "Category": "", "ElectronConfiguration": "1s1", "ElectronsPerShell": 1, "Electronegativity": 2.2, "CovalentRadius": 31, "AtomicRadius": null, "VdWRadius": 120, "CAS": "12385-13-6" }, { "Name": "Helium", "Symbol": "He", "Appearance": "colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field", "AtomicWeight": 4.002602, "AtomicNumber": 2, "Group": 18, "Period": 1, "Block": "s-block", "Category": "", "ElectronConfiguration": "1s2", "ElectronsPerShell": 2, "CovalentRadius": 28, "AtomicRadius": null, "VdWRadius": 140, "CAS": "7440-59-7" }, { "Name": "Lithium", "Symbol": "Li", "Appearance": "silvery-white", "AtomicWeight": 6.938, "AtomicNumber": 3, "Group": 1, "Period": 2, "Block": "s-block", "Category": "", "ElectronConfiguration": "[He] 2s1", "ElectronsPerShell": "2, 1", "Electronegativity": 0.98, "CovalentRadius": 128, "AtomicRadius": 152, "VdWRadius": 182, "CAS": "7439-93-2" }, { "Name": "Beryllium", "Symbol": "Be", "Appearance": "white-gray metallic", "AtomicWeight": 9.0121831, "AtomicNumber": 4, "Group": 2, "Period": 2, "Block": "s-block", "Category": "", "ElectronConfiguration": "[He] 2s2", "ElectronsPerShell": "2, 2", "Electronegativity": 1.57, "CovalentRadius": 96, "AtomicRadius": 112, "VdWRadius": 153, "CAS": "7440-41-7" }, { "Name": "Boron", "Symbol": "B", "Appearance": "black-brown", "AtomicWeight": 10.806, "AtomicNumber": 5, "Group": 13, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p1", "ElectronsPerShell": "2, 3", "Electronegativity": 2.04, "CovalentRadius": 84, "AtomicRadius": 90, "VdWRadius": 192, "CAS": "7440-42-8" }, { "Name": "Carbon", "Symbol": "C", "Appearance": "graphite: black, metallic-lookingdiamond: clear", "AtomicWeight": 12.0096, "AtomicNumber": 6, "Group": 14, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p2", "ElectronsPerShell": "2, 4", "Electronegativity": 2.55, "CovalentRadius": 77, "AtomicRadius": null, "VdWRadius": 170, "CAS": "7782-42-5" }, { "Name": "Nitrogen", "Symbol": "N", "Appearance": "colorless gas, liquid or solid", "AtomicWeight": 14.00643, "AtomicNumber": 7, "Group": 15, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p3", "ElectronsPerShell": "2, 5", "Electronegativity": 3.04, "CovalentRadius": 71, "AtomicRadius": null, "VdWRadius": 155, "CAS": "17778-88-0" }, { "Name": "Oxygen", "Symbol": "O", "Appearance": "gas: colorlessliquid and solid: pale blue", "AtomicWeight": 15.99903, "AtomicNumber": 8, "Group": 16, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p4", "ElectronsPerShell": "2, 6", "Electronegativity": 3.44, "CovalentRadius": 66, "AtomicRadius": null, "VdWRadius": 152, "CAS": "7782-44-7" }, { "Name": "Fluorine", "Symbol": "F", "Appearance": "gas: very pale yellowliquid: bright yellowsolid: alpha is opaque, beta is transparent", "AtomicWeight": 18.998403163, "AtomicNumber": 9, "Group": 17, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p5[2]", "ElectronsPerShell": "2, 7", "Electronegativity": 3.98, "CovalentRadius": 64, "AtomicRadius": null, "VdWRadius": 135, "CAS": "7782-41-4" }, { "Name": "Neon", "Symbol": "Ne", "Appearance": "colorless gas exhibiting an orange-red glow when placed in an electric field", "AtomicWeight": 20.1797, "AtomicNumber": 10, "Group": 18, "Period": 2, "Block": "p-block", "Category": "", "ElectronConfiguration": "[He] 2s2 2p6", "ElectronsPerShell": "2, 8", "Electronegativity": null, "CovalentRadius": 58, "AtomicRadius": null, "VdWRadius": 154, "CAS": "7440-01-9" }, { "Name": "Sodium", "Symbol": "Na", "Appearance": "silvery white metallic", "AtomicWeight": 22.98976928, "AtomicNumber": 11, "Group": 1, "Period": 3, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Ne] 3s1", "ElectronsPerShell": "2, 8, 1", "Electronegativity": 0.93, "CovalentRadius": 166, "AtomicRadius": 186, "VdWRadius": 227, "CAS": "7440-23-5" }, { "Name": "Magnesium", "Symbol": "Mg", "Appearance": "shiny grey solid", "AtomicWeight": 24.304, "AtomicNumber": 12, "Group": 2, "Period": 3, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2", "ElectronsPerShell": "2, 8, 2", "Electronegativity": 1.31, "CovalentRadius": 141, "AtomicRadius": 160, "VdWRadius": 173, "CAS": "7439-95-4" }, { "Name": "Aluminium", "Symbol": "Al", "Appearance": "silvery gray metallic", "AtomicWeight": 26.9815384, "AtomicNumber": 13, "Group": 13, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p1", "ElectronsPerShell": "2, 8, 3", "Electronegativity": 1.61, "CovalentRadius": 121, "AtomicRadius": 143, "VdWRadius": 184, "CAS": "7429-90-5" }, { "Name": "Silicon", "Symbol": "Si", "Appearance": "crystalline, reflective with bluish-tinged faces", "AtomicWeight": 28.084, "AtomicNumber": 14, "Group": 14, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p2", "ElectronsPerShell": "2, 8, 4", "Electronegativity": 1.9, "CovalentRadius": 111, "AtomicRadius": 111, "VdWRadius": 210, "CAS": "7440-21-3" }, { "Name": "Phosphorus", "Symbol": "P", "Appearance": "waxy white, yellow, red, violet, black metallic-looking", "AtomicWeight": 30.973761998, "AtomicNumber": 15, "Group": 15, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p3", "ElectronsPerShell": "2, 8, 5", "Electronegativity": 2.19, "CovalentRadius": 107, "AtomicRadius": null, "VdWRadius": 180, "CAS": "7723-14-0" }, { "Name": "Sulfur", "Symbol": "S", "Appearance": "lemon yellow sintered microcrystals", "AtomicWeight": 32.059, "AtomicNumber": 16, "Group": 16, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p4", "ElectronsPerShell": "2, 8, 6", "Electronegativity": 2.58, "CovalentRadius": 105, "AtomicRadius": null, "VdWRadius": 180, "CAS": "7704-34-9" }, { "Name": "Chlorine", "Symbol": "Cl", "Appearance": "pale yellow-green gas", "AtomicWeight": 35.446, "AtomicNumber": 17, "Group": 17, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p5", "ElectronsPerShell": "2, 8, 7", "Electronegativity": 3.16, "CovalentRadius": 102, "AtomicRadius": null, "VdWRadius": 175, "CAS": "7782-50-5" }, { "Name": "Argon", "Symbol": "Ar", "Appearance": "colorless gas exhibiting a lilac/violet glow when placed in an electric field", "AtomicWeight": 39.792, "AtomicNumber": 18, "Group": 18, "Period": 3, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ne] 3s2 3p6", "ElectronsPerShell": "2, 8, 8", "CovalentRadius": 106, "AtomicRadius": null, "VdWRadius": 188, "CAS": "7440-37-1" }, { "Name": "Potassium", "Symbol": "K", "Appearance": "silvery gray", "AtomicWeight": 39.0983, "AtomicNumber": 19, "Group": 1, "Period": 4, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Ar] 4s1", "ElectronsPerShell": "2, 8, 8, 1", "Electronegativity": 0.82, "CovalentRadius": 203, "AtomicRadius": 227, "VdWRadius": 275, "CAS": "7440-09-7" }, { "Name": "Calcium", "Symbol": "Ca", "Appearance": "dull gray, silver; with a pale yellow tint[1]", "AtomicWeight": 40.078, "AtomicNumber": 20, "Group": 2, "Period": 4, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Ar] 4s2", "ElectronsPerShell": "2, 8, 8, 2", "Electronegativity": 1, "CovalentRadius": 176, "AtomicRadius": 197, "VdWRadius": 231, "CAS": "7440-70-2" }, { "Name": "Scandium", "Symbol": "Sc", "Appearance": "silvery white", "AtomicWeight": 44.955908, "AtomicNumber": 21, "Group": 3, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d1 4s2", "ElectronsPerShell": "2, 8, 9, 2", "Electronegativity": 1.36, "CovalentRadius": 170, "AtomicRadius": 162, "VdWRadius": 211, "CAS": "7440-20-2" }, { "Name": "Titanium", "Symbol": "Ti", "Appearance": "silvery grey-white metallic", "AtomicWeight": 47.867, "AtomicNumber": 22, "Group": 4, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d2 4s2", "ElectronsPerShell": "2, 8, 10, 2", "Electronegativity": 1.54, "CovalentRadius": 160, "AtomicRadius": 147, "VdWRadius": null, "CAS": "7440-32-6" }, { "Name": "Vanadium", "Symbol": "V", "Appearance": "blue-silver-grey metal", "AtomicWeight": 50.9415, "AtomicNumber": 23, "Group": 5, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d3 4s2", "ElectronsPerShell": "2, 8, 11, 2", "Electronegativity": 1.63, "CovalentRadius": 153, "AtomicRadius": 134, "VdWRadius": null, "CAS": "7440-62-2" }, { "Name": "Chromium", "Symbol": "Cr", "Appearance": "silvery metallic", "AtomicWeight": 51.9961, "AtomicNumber": 24, "Group": 6, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d5 4s1", "ElectronsPerShell": "2, 8, 13, 1", "Electronegativity": 1.66, "CovalentRadius": 139, "AtomicRadius": 128, "VdWRadius": null, "CAS": "7440-47-3" }, { "Name": "Manganese", "Symbol": "Mn", "Appearance": "silvery metallic", "AtomicWeight": 54.938043, "AtomicNumber": 25, "Group": 7, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d5 4s2", "ElectronsPerShell": "2, 8, 13, 2", "Electronegativity": 1.55, "CovalentRadius": 139, "AtomicRadius": 127, "VdWRadius": null, "CAS": "7439-96-5" }, { "Name": "Iron", "Symbol": "Fe", "Appearance": "lustrous metallic with a grayish tinge", "AtomicWeight": 55.845, "AtomicNumber": 26, "Group": 8, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d6 4s2", "ElectronsPerShell": "2, 8, 14, 2", "Electronegativity": 1.83, "CovalentRadius": 132, "AtomicRadius": 126, "VdWRadius": null, "CAS": "7439-89-6" }, { "Name": "Cobalt", "Symbol": "Co", "Appearance": "hard lustrous bluish gray metal", "AtomicWeight": 58.933194, "AtomicNumber": 27, "Group": 9, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d7 4s2", "ElectronsPerShell": "2, 8, 15, 2", "Electronegativity": 1.88, "CovalentRadius": 126, "AtomicRadius": 125, "VdWRadius": null, "CAS": "7440-48-4" }, { "Name": "Nickel", "Symbol": "Ni", "Appearance": "lustrous, metallic, and silver with a gold tinge", "AtomicWeight": 58.6934, "AtomicNumber": 28, "Group": 10, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d8 4s2 or [Ar] 3d9 4s1", "ElectronsPerShell": "2, 8, 16, 2 or 2, 8, 17, 1", "Electronegativity": 1.91, "CovalentRadius": 124, "AtomicRadius": 124, "VdWRadius": 163, "CAS": "7440-02-0" }, { "Name": "Copper", "Symbol": "Cu", "Appearance": "red-orange metallic luster", "AtomicWeight": 63.546, "AtomicNumber": 29, "Group": 11, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s1", "ElectronsPerShell": "2, 8, 18, 1", "Electronegativity": 1.9, "CovalentRadius": 132, "AtomicRadius": 128, "VdWRadius": 140, "CAS": "7440-50-8" }, { "Name": "Zinc", "Symbol": "Zn", "Appearance": "silver-gray", "AtomicWeight": 65.38, "AtomicNumber": 30, "Group": 12, "Period": 4, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2", "ElectronsPerShell": "2, 8, 18, 2", "Electronegativity": 1.65, "CovalentRadius": 122, "AtomicRadius": 134, "VdWRadius": 139, "CAS": "7440-66-6" }, { "Name": "Gallium", "Symbol": "Ga", "Appearance": "silvery blue", "AtomicWeight": 69.723, "AtomicNumber": 31, "Group": 13, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p1", "ElectronsPerShell": "2, 8, 18, 3", "Electronegativity": 1.81, "CovalentRadius": 122, "AtomicRadius": 135, "VdWRadius": 187, "CAS": "7440-55-3" }, { "Name": "Germanium", "Symbol": "Ge", "Appearance": "grayish-white", "AtomicWeight": 72.63, "AtomicNumber": 32, "Group": 14, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p2", "ElectronsPerShell": "2, 8, 18, 4", "Electronegativity": 2.01, "CovalentRadius": 122, "AtomicRadius": 122, "VdWRadius": 211, "CAS": "7440-56-4" }, { "Name": "Arsenic", "Symbol": "As", "Appearance": "metallic grey", "AtomicWeight": 74.921595, "AtomicNumber": 33, "Group": 15, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p3", "ElectronsPerShell": "2, 8, 18, 5", "Electronegativity": 2.18, "CovalentRadius": 119, "AtomicRadius": 119, "VdWRadius": 185, "CAS": "7440-38-2" }, { "Name": "Selenium", "Symbol": "Se", "Appearance": "grey metallic-looking, red, and vitreous black (not pictured) allotropes", "AtomicWeight": 78.971, "AtomicNumber": 34, "Group": 16, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p4", "ElectronsPerShell": "2, 8, 18, 6", "Electronegativity": 2.55, "CovalentRadius": 120, "AtomicRadius": 120, "VdWRadius": 190, "CAS": "7782-49-2" }, { "Name": "Bromine", "Symbol": "Br", "Appearance": "reddish-brown", "AtomicWeight": 79.901, "AtomicNumber": 35, "Group": 17, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p5", "ElectronsPerShell": "2, 8, 18, 7", "Electronegativity": 2.96, "CovalentRadius": 120, "AtomicRadius": 120, "VdWRadius": 185, "CAS": "7726-95-6" }, { "Name": "Krypton", "Symbol": "Kr", "Appearance": "colorless gas, exhibiting a whitish glow in an electric field", "AtomicWeight": 83.798, "AtomicNumber": 36, "Group": 18, "Period": 4, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Ar] 3d10 4s2 4p6", "ElectronsPerShell": "2, 8, 18, 8", "Electronegativity": 3, "CovalentRadius": 116, "AtomicRadius": null, "VdWRadius": 202, "CAS": "7439-90-9" }, { "Name": "Rubidium", "Symbol": "Rb", "Appearance": "grey white", "AtomicWeight": 85.4678, "AtomicNumber": 37, "Group": 1, "Period": 5, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Kr] 5s1", "ElectronsPerShell": "2, 8, 18, 8, 1", "Electronegativity": 0.82, "CovalentRadius": 220, "AtomicRadius": 248, "VdWRadius": 303, "CAS": "7440-17-7" }, { "Name": "Strontium", "Symbol": "Sr", "Appearance": "silvery white metallic; with a pale yellow tint[1]", "AtomicWeight": 87.62, "AtomicNumber": 38, "Group": 2, "Period": 5, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Kr] 5s2", "ElectronsPerShell": "2, 8, 18, 8, 2", "Electronegativity": 0.95, "CovalentRadius": 195, "AtomicRadius": 215, "VdWRadius": 249, "CAS": "7440-24-6" }, { "Name": "Yttrium", "Symbol": "Y", "Appearance": "silvery white", "AtomicWeight": 88.90584, "AtomicNumber": 39, "Group": 3, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d1 5s2", "ElectronsPerShell": "2, 8, 18, 9, 2", "Electronegativity": 1.22, "CovalentRadius": 190, "AtomicRadius": 180, "VdWRadius": null, "CAS": "7440-65-5" }, { "Name": "Zirconium", "Symbol": "Zr", "Appearance": "silvery white", "AtomicWeight": 91.224, "AtomicNumber": 40, "Group": 4, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d2 5s2", "ElectronsPerShell": "2, 8, 18, 10, 2", "Electronegativity": 1.33, "CovalentRadius": 175, "AtomicRadius": 160, "VdWRadius": null, "CAS": "7440-67-7" }, { "Name": "Niobium", "Symbol": "Nb", "Appearance": "gray metallic, bluish when oxidized", "AtomicWeight": 92.90637, "AtomicNumber": 41, "Group": 5, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d4 5s1", "ElectronsPerShell": "2, 8, 18, 12, 1", "Electronegativity": 1.6, "CovalentRadius": 164, "AtomicRadius": 146, "VdWRadius": null, "CAS": "7440-03-1" }, { "Name": "Molybdenum", "Symbol": "Mo", "Appearance": "gray metallic", "AtomicWeight": 95.95, "AtomicNumber": 42, "Group": 6, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d5 5s1", "ElectronsPerShell": "2, 8, 18, 13, 1", "Electronegativity": 2.16, "CovalentRadius": 154, "AtomicRadius": 139, "VdWRadius": null, "CAS": "7439-98-7" }, { "Name": "Technetium", "Symbol": "Tc", "Appearance": "shiny gray metal", "AtomicWeight": 97, "AtomicNumber": 43, "Group": 7, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d5 5s2", "ElectronsPerShell": "2, 8, 18, 13, 2", "Electronegativity": 1.9, "CovalentRadius": 147, "AtomicRadius": 136, "VdWRadius": null, "CAS": "7440-26-8" }, { "Name": "Ruthenium", "Symbol": "Ru", "Appearance": "silvery white metallic", "AtomicWeight": 101.07, "AtomicNumber": 44, "Group": 8, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d7 5s1", "ElectronsPerShell": "2, 8, 18, 15, 1", "Electronegativity": 2.2, "CovalentRadius": 146, "AtomicRadius": 134, "VdWRadius": null, "CAS": "7440-18-8" }, { "Name": "Rhodium", "Symbol": "Rh", "Appearance": "silvery white metallic", "AtomicWeight": 102.90549, "AtomicNumber": 45, "Group": 9, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d8 5s1", "ElectronsPerShell": "2, 8, 18, 16, 1", "Electronegativity": 2.28, "CovalentRadius": 142, "AtomicRadius": 134, "VdWRadius": null, "CAS": "7440-16-6" }, { "Name": "Palladium", "Symbol": "Pd", "Appearance": "silvery white", "AtomicWeight": 106.42, "AtomicNumber": 46, "Group": 10, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10", "ElectronsPerShell": "2, 8, 18, 18", "Electronegativity": 2.2, "CovalentRadius": 139, "AtomicRadius": 137, "VdWRadius": 163, "CAS": "7440-05-3" }, { "Name": "Silver", "Symbol": "Ag", "Appearance": "lustrous white metal", "AtomicWeight": 107.8682, "AtomicNumber": 47, "Group": 11, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s1", "ElectronsPerShell": "2, 8, 18, 18, 1", "Electronegativity": 1.93, "CovalentRadius": 145, "AtomicRadius": 144, "VdWRadius": 172, "CAS": "7440-22-4" }, { "Name": "Cadmium", "Symbol": "Cd", "Appearance": "silvery bluish-gray metallic", "AtomicWeight": 112.414, "AtomicNumber": 48, "Group": 12, "Period": 5, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2", "ElectronsPerShell": "2, 8, 18, 18, 2", "Electronegativity": 1.69, "CovalentRadius": 144, "AtomicRadius": 151, "VdWRadius": 158, "CAS": "7440-43-9" }, { "Name": "Indium", "Symbol": "In", "Appearance": "silvery lustrous gray", "AtomicWeight": 114.818, "AtomicNumber": 49, "Group": 13, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p1", "ElectronsPerShell": "2, 8, 18, 18, 3", "Electronegativity": 1.78, "CovalentRadius": 142, "AtomicRadius": 167, "VdWRadius": 193, "CAS": "7440-74-6" }, { "Name": "Tin", "Symbol": "Sn", "Appearance": "silvery-white (beta, β) or gray (alpha, α)", "AtomicWeight": 118.71, "AtomicNumber": 50, "Group": 14, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p2", "ElectronsPerShell": "2, 8, 18, 18, 4", "Electronegativity": 1.96, "CovalentRadius": 139, "AtomicRadius": 140, "VdWRadius": 217, "CAS": "7440-31-5" }, { "Name": "Antimony", "Symbol": "Sb", "Appearance": "silvery lustrous gray", "AtomicWeight": 121.76, "AtomicNumber": 51, "Group": 15, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p3", "ElectronsPerShell": "2, 8, 18, 18, 5", "Electronegativity": 2.05, "CovalentRadius": 139, "AtomicRadius": 140, "VdWRadius": 206, "CAS": "7440-36-0" }, { "Name": "Tellurium", "Symbol": "Te", "Appearance": "silvery lustrous gray (crystalline),brown-black powder (amorphous)", "AtomicWeight": 127.6, "AtomicNumber": 52, "Group": 16, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p4", "ElectronsPerShell": "2, 8, 18, 18, 6", "Electronegativity": 2.1, "CovalentRadius": 138, "AtomicRadius": 140, "VdWRadius": 206, "CAS": "13494-80-9" }, { "Name": "Iodine", "Symbol": "I", "Appearance": "lustrous metallic gray solid, black/violet liquid, violet gas", "AtomicWeight": 126.90447, "AtomicNumber": 53, "Group": 17, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p5", "ElectronsPerShell": "2, 8, 18, 18, 7", "Electronegativity": 2.66, "CovalentRadius": 139, "AtomicRadius": 140, "VdWRadius": 198, "CAS": "7553-56-2" }, { "Name": "Xenon", "Symbol": "Xe", "Appearance": "colorless gas, exhibiting a blue glow when placed in an electric field", "AtomicWeight": 131.293, "AtomicNumber": 54, "Group": 18, "Period": 5, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Kr] 4d10 5s2 5p6", "ElectronsPerShell": "2, 8, 18, 18, 8", "Electronegativity": 2.6, "CovalentRadius": 140, "AtomicRadius": null, "VdWRadius": 216, "CAS": "7440-63-3" }, { "Name": "Caesium", "Symbol": "Cs", "Appearance": "pale gold", "AtomicWeight": 132.90545196, "AtomicNumber": 55, "Group": 1, "Period": 6, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Xe] 6s1", "ElectronsPerShell": "2, 8, 18, 18, 8, 1", "Electronegativity": 0.79, "CovalentRadius": 244, "AtomicRadius": 265, "VdWRadius": 343, "CAS": "7440-46-2" }, { "Name": "Barium", "Symbol": "Ba", "Appearance": "silvery gray; with a pale yellow tint[1]", "AtomicWeight": 137.327, "AtomicNumber": 56, "Group": 2, "Period": 6, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Xe] 6s2", "ElectronsPerShell": "2, 8, 18, 18, 8, 2", "Electronegativity": 0.89, "CovalentRadius": 215, "AtomicRadius": 222, "VdWRadius": 268, "CAS": "7440-39-3" }, { "Name": "Lanthanum", "Symbol": "La", "Appearance": "silvery white", "AtomicWeight": 138.90547, "AtomicNumber": 57, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 5d1 6s2", "ElectronsPerShell": "2, 8, 18, 18, 9, 2", "Electronegativity": 1.1, "CovalentRadius": 207, "AtomicRadius": 187, "VdWRadius": null, "CAS": "7439-91-0" }, { "Name": "Cerium", "Symbol": "Ce", "Appearance": "silvery white", "AtomicWeight": 140.116, "AtomicNumber": 58, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f1 5d1 6s2[2]", "ElectronsPerShell": "2, 8, 18, 19, 9, 2", "Electronegativity": 1.12, "CovalentRadius": 204, "AtomicRadius": 181, "VdWRadius": null, "CAS": "7440-45-1" }, { "Name": "Praseodymium", "Symbol": "Pr", "Appearance": "grayish white", "AtomicWeight": 140.90766, "AtomicNumber": 59, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f3 6s2", "ElectronsPerShell": "2, 8, 18, 21, 8, 2", "Electronegativity": 1.13, "CovalentRadius": 203, "AtomicRadius": 182, "VdWRadius": null, "CAS": "7440-10-0" }, { "Name": "Neodymium", "Symbol": "Nd", "Appearance": "silvery white", "AtomicWeight": 144.242, "AtomicNumber": 60, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f4 6s2", "ElectronsPerShell": "2, 8, 18, 22, 8, 2", "Electronegativity": 1.14, "CovalentRadius": 201, "AtomicRadius": 181, "VdWRadius": null, "CAS": "7440-00-8" }, { "Name": "Promethium", "Symbol": "Pm", "Appearance": "metallic", "AtomicWeight": 145, "AtomicNumber": 61, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f5 6s2", "ElectronsPerShell": "2, 8, 18, 23, 8, 2", "Electronegativity": 1.13, "CovalentRadius": 199, "AtomicRadius": 183, "VdWRadius": null, "CAS": "7440-12-2" }, { "Name": "Samarium", "Symbol": "Sm", "Appearance": "silvery white", "AtomicWeight": 150.36, "AtomicNumber": 62, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f6 6s2", "ElectronsPerShell": "2, 8, 18, 24, 8, 2", "Electronegativity": 1.17, "CovalentRadius": 198, "AtomicRadius": 180, "VdWRadius": null, "CAS": "7440-19-9" }, { "Name": "Europium", "Symbol": "Eu", "Appearance": "silvery white, with a pale yellow tint;[1] but rarely seen without oxide discoloration", "AtomicWeight": 151.964, "AtomicNumber": 63, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f7 6s2", "ElectronsPerShell": "2, 8, 18, 25, 8, 2", "Electronegativity": 1.2, "CovalentRadius": 198, "AtomicRadius": 180, "VdWRadius": null, "CAS": "7440-53-1" }, { "Name": "Gadolinium", "Symbol": "Gd", "Appearance": "silvery white", "AtomicWeight": 157.25, "AtomicNumber": 64, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f7 5d1 6s2", "ElectronsPerShell": "2, 8, 18, 25, 9, 2", "Electronegativity": 1.2, "CovalentRadius": 196, "AtomicRadius": 180, "VdWRadius": null, "CAS": "7440-54-2" }, { "Name": "Terbium", "Symbol": "Tb", "Appearance": "silvery white", "AtomicWeight": 158.925354, "AtomicNumber": 65, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f9 6s2", "ElectronsPerShell": "2, 8, 18, 27, 8, 2", "Electronegativity": 1.2, "CovalentRadius": 194, "AtomicRadius": 177, "VdWRadius": null, "CAS": "7440-27-9" }, { "Name": "Dysprosium", "Symbol": "Dy", "Appearance": "silvery white", "AtomicWeight": 162.5, "AtomicNumber": 66, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f10 6s2", "ElectronsPerShell": "2, 8, 18, 28, 8, 2", "Electronegativity": 1.22, "CovalentRadius": 192, "AtomicRadius": 178, "VdWRadius": null, "CAS": "7429-91-6" }, { "Name": "Holmium", "Symbol": "Ho", "Appearance": "silvery white", "AtomicWeight": 164.930328, "AtomicNumber": 67, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f11 6s2", "ElectronsPerShell": "2, 8, 18, 29, 8, 2", "Electronegativity": 1.23, "CovalentRadius": 192, "AtomicRadius": 176, "VdWRadius": null, "CAS": "7440-60-0" }, { "Name": "Erbium", "Symbol": "Er", "Appearance": "silvery white", "AtomicWeight": 167.259, "AtomicNumber": 68, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f12 6s2", "ElectronsPerShell": "2, 8, 18, 30, 8, 2", "Electronegativity": 1.24, "CovalentRadius": 189, "AtomicRadius": 176, "VdWRadius": null, "CAS": "7440-52-0" }, { "Name": "Thulium", "Symbol": "Tm", "Appearance": "silvery gray", "AtomicWeight": 168.934218, "AtomicNumber": 69, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f13 6s2", "ElectronsPerShell": "2, 8, 18, 31, 8, 2", "Electronegativity": 1.25, "CovalentRadius": 190, "AtomicRadius": 176, "VdWRadius": null, "CAS": "7440-30-4" }, { "Name": "Ytterbium", "Symbol": "Yb", "Appearance": "silvery white; with a pale yellow tint[1]", "AtomicWeight": 173.045, "AtomicNumber": 70, "Period": 6, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 6s2", "ElectronsPerShell": "2, 8, 18, 32, 8, 2", "Electronegativity": 1.1, "CovalentRadius": 187, "AtomicRadius": 176, "VdWRadius": null, "CAS": "7440-64-4" }, { "Name": "Lutetium", "Symbol": "Lu", "Appearance": "silvery white", "AtomicWeight": 174.9668, "AtomicNumber": 71, "Group": 3, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d1 6s2", "ElectronsPerShell": "2, 8, 18, 32, 9, 2", "Electronegativity": 1.27, "CovalentRadius": 187, "AtomicRadius": 174, "VdWRadius": null, "CAS": "7439-94-3" }, { "Name": "Hafnium", "Symbol": "Hf", "Appearance": "steel gray", "AtomicWeight": 178.486, "AtomicNumber": 72, "Group": 4, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d2 6s2", "ElectronsPerShell": "2, 8, 18, 32, 10, 2", "Electronegativity": 1.3, "CovalentRadius": 175, "AtomicRadius": 159, "VdWRadius": null, "CAS": "7440-58-6" }, { "Name": "Tantalum", "Symbol": "Ta", "Appearance": "gray blue", "AtomicWeight": 180.94788, "AtomicNumber": 73, "Group": 5, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d3 6s2", "ElectronsPerShell": "2, 8, 18, 32, 11, 2", "Electronegativity": 1.5, "CovalentRadius": 170, "AtomicRadius": 146, "VdWRadius": null, "CAS": "7440-25-7" }, { "Name": "Tungsten", "Symbol": "W", "Appearance": "grayish white, lustrous", "AtomicWeight": 183.84, "AtomicNumber": 74, "Group": 6, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d4 6s2[2]", "ElectronsPerShell": "2, 8, 18, 32, 12, 2", "Electronegativity": 2.36, "CovalentRadius": 162, "AtomicRadius": 139, "VdWRadius": null, "CAS": "7440-33-7" }, { "Name": "Rhenium", "Symbol": "Re", "Appearance": "silvery-grayish", "AtomicWeight": 186.207, "AtomicNumber": 75, "Group": 7, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d5 6s2", "ElectronsPerShell": "2, 8, 18, 32, 13, 2", "Electronegativity": 1.9, "CovalentRadius": 151, "AtomicRadius": 137, "VdWRadius": null, "CAS": "7440-15-5" }, { "Name": "Osmium", "Symbol": "Os", "Appearance": "silvery, blue cast", "AtomicWeight": 190.23, "AtomicNumber": 76, "Group": 8, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d6 6s2", "ElectronsPerShell": "2, 8, 18, 32, 14, 2", "Electronegativity": 2.2, "CovalentRadius": 144, "AtomicRadius": 135, "VdWRadius": null, "CAS": "7440-04-2" }, { "Name": "Iridium", "Symbol": "Ir", "Appearance": "silvery white", "AtomicWeight": 192.217, "AtomicNumber": 77, "Group": 9, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d7 6s2", "ElectronsPerShell": "2, 8, 18, 32, 15, 2", "Electronegativity": 2.2, "CovalentRadius": 141, "AtomicRadius": 136, "VdWRadius": null, "CAS": "7439-88-5" }, { "Name": "Platinum", "Symbol": "Pt", "Appearance": "silvery white", "AtomicWeight": 195.084, "AtomicNumber": 78, "Group": 10, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d9 6s1", "ElectronsPerShell": "2, 8, 18, 32, 17, 1", "Electronegativity": 2.28, "CovalentRadius": 136, "AtomicRadius": 139, "VdWRadius": 175, "CAS": "7440-06-4" }, { "Name": "Gold", "Symbol": "Au", "Appearance": "metallic yellow", "AtomicWeight": 196.96657, "AtomicNumber": 79, "Group": 11, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s1", "ElectronsPerShell": "2, 8, 18, 32, 18, 1", "Electronegativity": 2.54, "CovalentRadius": 136, "AtomicRadius": 144, "VdWRadius": 166, "CAS": "7440-57-5" }, { "Name": "Mercury", "Symbol": "Hg", "Appearance": "shiny, silvery liquid", "AtomicWeight": 200.592, "AtomicNumber": 80, "Group": 12, "Period": 6, "Block": "d-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2", "ElectronsPerShell": "2, 8, 18, 32, 18, 2", "Electronegativity": 2, "CovalentRadius": 132, "AtomicRadius": 151, "VdWRadius": 155, "CAS": "7439-97-6" }, { "Name": "Thallium", "Symbol": "Tl", "Appearance": "silvery white", "AtomicWeight": 204.382, "AtomicNumber": 81, "Group": 13, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p1", "ElectronsPerShell": "2, 8, 18, 32, 18, 3", "Electronegativity": 1.62, "CovalentRadius": 145, "AtomicRadius": 170, "VdWRadius": 196, "CAS": "7440-28-0" }, { "Name": "Lead", "Symbol": "Pb", "Appearance": "metallic gray", "AtomicWeight": 207.2, "AtomicNumber": 82, "Group": 14, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p2", "ElectronsPerShell": "2, 8, 18, 32, 18, 4", "Electronegativity": 1.87, "CovalentRadius": 146, "AtomicRadius": 175, "VdWRadius": 202, "CAS": "7439-92-1" }, { "Name": "Bismuth", "Symbol": "Bi", "Appearance": "lustrous brownish silver", "AtomicWeight": 208.9804, "AtomicNumber": 83, "Group": 15, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p3", "ElectronsPerShell": "2, 8, 18, 32, 18, 5", "Electronegativity": 2.02, "CovalentRadius": 148, "AtomicRadius": 156, "VdWRadius": 207, "CAS": "7440-69-9" }, { "Name": "Polonium", "Symbol": "Po", "Appearance": "silvery", "AtomicWeight": 209, "AtomicNumber": 84, "Group": 16, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p4", "ElectronsPerShell": "2, 8, 18, 32, 18, 6", "Electronegativity": 2, "CovalentRadius": 140, "AtomicRadius": 168, "VdWRadius": 197, "CAS": "7440-08-6" }, { "Name": "Astatine", "Symbol": "At", "Appearance": "unknown, probably metallic", "AtomicWeight": 210, "AtomicNumber": 85, "Group": 17, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p5", "ElectronsPerShell": "2, 8, 18, 32, 18, 7", "Electronegativity": 2.2, "CovalentRadius": 150, "AtomicRadius": null, "VdWRadius": 202, "CAS": "7440-68-8" }, { "Name": "Radon", "Symbol": "Rn", "Appearance": "colorless gas", "AtomicWeight": 222, "AtomicNumber": 86, "Group": 18, "Period": 6, "Block": "p-block", "Category": "", "ElectronConfiguration": "[Xe] 4f14 5d10 6s2 6p6", "ElectronsPerShell": "2, 8, 18, 32, 18, 8", "Electronegativity": 2.2, "CovalentRadius": 150, "AtomicRadius": null, "VdWRadius": 220, "CAS": "10043-92-2" }, { "Name": "Francium", "Symbol": "Fr", "Appearance": "", "AtomicWeight": 223, "AtomicNumber": 87, "Group": 1, "Period": 7, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Rn] 7s1", "ElectronsPerShell": "2, 8, 18, 32, 18, 8, 1", "Electronegativity": 0.79, "CovalentRadius": 260, "AtomicRadius": null, "VdWRadius": 348, "CAS": "7440-73-5" }, { "Name": "Radium", "Symbol": "Ra", "Appearance": "silvery white metallic", "AtomicWeight": 226, "AtomicNumber": 88, "Group": 2, "Period": 7, "Block": "s-block", "Category": "", "ElectronConfiguration": "[Rn] 7s2", "ElectronsPerShell": "2, 8, 18, 32, 18, 8, 2", "Electronegativity": 0.9, "CovalentRadius": 221, "AtomicRadius": null, "VdWRadius": 283, "CAS": "7440-14-4" }, { "Name": "Actinium", "Symbol": "Ac", "Appearance": "silvery-white, glowing with an eerie blue light;[1] sometimes with a golden cast[2]", "AtomicWeight": 227, "AtomicNumber": 89, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 6d1 7s2", "ElectronsPerShell": "2, 8, 18, 32, 18, 9, 2", "Electronegativity": 1.1, "CovalentRadius": 215, "AtomicRadius": null, "VdWRadius": null, "CAS": "7440-34-8" }, { "Name": "Thorium", "Symbol": "Th", "Appearance": "silvery, often with black tarnish", "AtomicWeight": 232.0377, "AtomicNumber": 90, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 6d2 7s2", "ElectronsPerShell": "2, 8, 18, 32, 18, 10, 2", "Electronegativity": 1.3, "CovalentRadius": 206, "AtomicRadius": 179, "VdWRadius": null, "CAS": "7440-29-1" }, { "Name": "Protactinium", "Symbol": "Pa", "Appearance": "bright, silvery metallic luster", "AtomicWeight": 231.03588, "AtomicNumber": 91, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f2 6d1 7s2", "ElectronsPerShell": "2, 8, 18, 32, 20, 9, 2", "Electronegativity": 1.5, "CovalentRadius": 200, "AtomicRadius": 163, "VdWRadius": null, "CAS": "7440-13-3" }, { "Name": "Uranium", "Symbol": "U", "Appearance": "silvery gray metallic; corrodes to a spalling black oxide coat in air", "AtomicWeight": 238.02891, "AtomicNumber": 92, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f3 6d1 7s2", "ElectronsPerShell": "2, 8, 18, 32, 21, 9, 2", "Electronegativity": 1.38, "CovalentRadius": 196, "AtomicRadius": 156, "VdWRadius": 186, "CAS": "7440-61-1" }, { "Name": "Neptunium", "Symbol": "Np", "Appearance": "silvery metallic", "AtomicWeight": 237, "AtomicNumber": 93, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f4 6d1 7s2", "ElectronsPerShell": "2, 8, 18, 32, 22, 9, 2", "Electronegativity": 1.36, "CovalentRadius": 190, "AtomicRadius": 155, "VdWRadius": null, "CAS": "7439-99-8" }, { "Name": "Plutonium", "Symbol": "Pu", "Appearance": "silvery white, tarnishing to dark gray in air", "AtomicWeight": 244, "AtomicNumber": 94, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f6 7s2", "ElectronsPerShell": "2, 8, 18, 32, 24, 8, 2", "Electronegativity": 1.28, "CovalentRadius": 187, "AtomicRadius": 159, "VdWRadius": null, "CAS": "7440-07-5" }, { "Name": "Americium", "Symbol": "Am", "Appearance": "silvery white", "AtomicWeight": 243, "AtomicNumber": 95, "Group": 3, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f7 7s2", "ElectronsPerShell": "2, 8, 18, 32, 25, 8, 2", "Electronegativity": 1.3, "CovalentRadius": 180, "AtomicRadius": 173, "VdWRadius": null, "CAS": "7440-35-9" }, { "Name": "Curium", "Symbol": "Cm", "Appearance": "silvery metallic, glows purple in the dark", "AtomicWeight": 247, "AtomicNumber": 96, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f7 6d1 7s2", "ElectronsPerShell": "2, 8, 18, 32, 25, 9, 2", "Electronegativity": 1.3, "CovalentRadius": 169, "AtomicRadius": 174, "VdWRadius": null, "CAS": "7440-51-9" }, { "Name": "Berkelium", "Symbol": "Bk", "Appearance": "silvery", "AtomicWeight": 247, "AtomicNumber": 97, "Period": 7, "Block": "f-block", "Category": "", "ElectronConfiguration": "[Rn] 5f9 7s2", "ElectronsPerShell": "2, 8, 18, 32, 27, 8, 2", "Electronegativity": 1.3, "CovalentRadius": null, "AtomicRadius": 170, "VdWRadius": null, "CAS": "7440-40-6" }, { "Name": "Californium", "Symbol": "Cf", "Appearance": "silvery", "AtomicWeight": 251, "AtomicNumber": 98, "Period": 7, "Block": "f-block",