Hydrogen 1 H 1.00794 1 1 1 Gas None Helium 2 He 4.002602 2 1 18 Gas Noble Gas Lithium 3 Li 6.941 2 1 2 1 Solid Alkali Metals Beryllium 4 Be 9.012182 2 2 2 2 Solid Alkaline - Earth Metals Boron 5 B 10.811 2 3 2 13 Solid Non Metals Carbon 6 C 12.0107 2 4 2 14 Solid Non Metals Nitrogen 7 N 14.00674 2 5 2 15 Gas Non Metals Oxygen 8 O 15.9994 2 6 2 16 Gas Non Metals Fluorine 9 F 18.9984032 2 7 2 17 Gas Non Metals Neon 10 Ne 20.1797 2 8 2 18 Gas Noble Gas Sodium 11 Na 22.98977 2 8 1 3 1 Solid Alkali Metals Magnesium 12 Mg 24.3050 2 8 2 3 2 Solid Alkaline - Earth Metals Aluminium 13 Al 26.981538 2 8 2 3 13 Solid Other Metals Silicon 14 Si 28.0855 2 8 4 3 14 Solid Non Metals Phosphorus 15 P 30.973761 2 8 5 3 15 Solid Non Metals Sulfur 16 S 32.066 2 8 6 3 16 Solid Non Metals Chlorine 17 Cl 35.4527 2 8 7 3 17 Gas Non Metals Argon 18 Ar 39.948 2 8 8 3 18 Gas Noble Gas Potassium 19 K 39.0983 2 8 8 1 4 1 Solid Alkali Metals Calcium 20 Ca 40.078 2 8 8 2 4 2 Solid Alkaline - Earth Metals Scandium 20 Sc 44.95591 2 8 9 2 4 3 Solid Transition Metals Titanium 21 Ti 47.867 2 8 10 2 4 4 Solid Transition Metals Vanadium 23 V 50.9415 2 8 11 2 4 5 Solid Transition Metals Chromium 24 Cr 51.9961 2 8 13 1 4 6 Solid Transition Metals Manganese 25 Mn 54.938049 2 8 13 2 4 7 Solid Transition Metals Iron 26 Fe 55.8457 2 8 14 2 4 8 Solid Transition Metals Cobalt 27 Co 58.933200 2 8 15 2 4 9 Solid Transition Metals Nickel 28 Ni 58.6934 2 8 16 2 4 10 Solid Transition Metals Copper 29 Cu 63.546 2 8 18 1 4 11 Solid Transition Metals Zinc 30 Zn 65.39 2 8 18 2 4 12 Solid Transition Metals Gallium 31 Ga 69.723 2 8 18 3 4 13 Solid Other Metals Germanium 32 Ge 72.61 2 8 18 4 4 14 Solid Other Metals Arsenic 33 As 74.9216 2 8 18 5 4 15 Solid Non Metals Selenium 34 Se 78.96 2 8 18 6 4 16 Solid Non Metals Bromine 35 Br 79.904 2 8 18 7 4 17 Liquid Non Metals Krypton 36 Kr 83.8 2 8 18 8 4 18 Gas Noble Gas Rubidium 37 Rb 85.4678 2 8 18 8 1 5 1 Solid Alkali Metals Strontium 38 Sr 87.62 2 8 18 8 2 5 2 Solid Alkaline - Earth Metals Yttrium 39 Y 88.90585 2 8 18 9 2 5 3 Solid Transition Metals Zirconium 40 Zr 91.224 2 8 18 10 2 5 4 Solid Transition Metals Niobium 41 Nb 92.90638 2 8 18 12 1 5 5 Solid Transition Metals Molybdenum 42 Mo 95.94 2 8 18 13 1 5 6 Solid Transition Metals Technetium 43 Tc 98 2 8 18 13 2 5 7 Synthetic Transition Metals Ruthenium 44 Ru 101.07 2 8 18 15 1 5 8 Solid Transition Metals Rhodium 45 Rh 102.9055 2 8 18 16 1 5 9 Solid Transition Metals Palladium 46 Pd 106.42 2 8 18 18 5 10 Solid Transition Metals Silver 47 Ag 107.8682 2 8 18 18 1 5 11 Solid Transition Metals Cadnium 48 Cd 112.411 2 8 18 18 2 5 12 Solid Transition Metals Indium 49 In 114.818 2 8 18 18 3 5 13 Solid Other Metals Tin 50 Sn 118.71 2 8 18 18 4 5 14 Solid Other Metals Antimony 51 Sb 121.76 2 8 18 18 5 5 15 Solid Other Metals Tellurium 52 Te 127.6 2 8 18 18 6 5 16 Solid Non Metals Iodine 53 I 126.90447 2 8 18 18 7 5 17 Solid Non Metals Xeon 54 Xe 131.29 2 8 18 18 8 5 18 Gas Noble Gas Cesium 55 Cs 132.90545 2 8 18 18 8 1 6 1 Solid Alkali Metals Barium 56 Ba 137.327 2 8 18 18 8 2 6 2 Solid Alkaline - Earth Metals Lanthanum 57 La 138.9055 2 8 18 18 9 2 6 3 Solid Transition Metals Halfnium 72 Hf 178.49 2 8 18 32 10 2 6 4 Solid Transition Metals Tantalum 73 Ta 180.9479 2 8 18 32 11 2 6 5 Solid Transition Metals Tungsten 74 W 183.84 2 8 18 32 12 2 6 6 Solid Transition Metals Rhenium 75 Re 186.207 2 8 18 32 13 2 6 7 Solid Transition Metals Osmium 76 Os 190.23 2 8 18 32 14 2 6 8 Solid Transition Metals Iridium 77 Ir 192.217 2 8 18 32 15 2 6 9 Solid Transition Metals Platinium 78 Pt 195.078 2 8 18 32 17 1 6 10 Solid Transition Metals Gold 79 Au 196.966552 2 8 18 32 18 1 6 11 Solid Transition Metals Mercury 80 Hg 200.59 2 8 18 32 18 2 6 12 Liquid Transition Metals Thallium 81 Tl 204.3833 2 8 18 32 18 3 6 13 Solid Other Metals Lead 82 Pb 207.2 2 8 18 32 18 4 6 14 Solid Other Metals Bismuth 83 Bi 208.92038 2 8 18 32 18 5 6 15 Solid Other Metals Polonium 84 Po 209 2 8 18 32 18 6 6 16 Solid Other Metals Astatine 85 At 210 2 8 18 32 18 7 6 17 Solid Non Metals Radon 86 Rn 222 2 8 18 32 18 8 6 18 Gas Noble Gas Francium 87 Fr 223 2 8 18 32 18 8 1 7 1 Solid Alkali Metals Radium 88 Ra 226 2 8 18 32 18 8 2 7 2 Solid Alkaline - Earth Metals Actinium 89 Ac 227 2 8 18 32 18 9 2 7 3 Solid Transition Metals Rutherforbium 104 Rf 267 2 8 18 32 32 10 2 7 4 Synthetic Transition Metals Dubnium 105 Db 268 2 8 18 32 32 11 2 7 5 Synthetic Transition Metals Seaborgium 106 Sg 271 2 8 18 32 32 12 2 7 6 Synthetic Transition Metals Bohrium 107 Bh 272 2 8 18 32 32 13 2 7 7 Synthetic Transition Metals Hassium 108 Hs 270 2 8 18 32 32 14 2 7 8 Synthetic Transition Metals Meitnerium 109 Mt 276 2 8 18 32 32 15 2 7 9 Synthetic Transition Metals Darmstadtium 110 Ds 281 2 8 18 32 32 17 1 7 10 Synthetic Transition Metals Roentgenium 111 Rg 280 2 8 18 32 32 18 1 7 11 Synthetic Transition Metals Copernicium 112 Cp 285 2 8 18 32 32 18 2 7 12 Synthetic Transition Metals Ununtrium 113 Uut 284 2 8 18 32 32 18 3 7 13 Synthetic Other Metals Ununquadium 114 Uuq 289 2 8 18 32 32 18 4 7 14 Synthetic Other Metals Ununpentium 115 Uup 288 2 8 18 32 32 18 5 7 15 Synthetic Other Metals Ununhexium 116 Uuh 293 2 8 18 32 32 18 6 7 16 Synthetic Other Metals Ununseptium 117 Uus 2 8 18 32 32 18 7 7 17 Synthetic Other Metals Ununoctium 118 Uuo 294 2 8 18 32 32 18 8 7 18 Synthetic Noble Gas Cerium 58 Ce 140.116 2 8 18 20 8 2 6 Solid Lanthanides Praseodymium 59 Pr 140.90765 2 8 18 21 8 2 6 Solid Lanthanides Neodymium 60 Nd 144.24 2 8 18 22 8 2 6 Solid Lanthanides Promethium 61 Pm 145 2 8 18 23 8 2 6 Synthetic Lanthanides Samarium 62 Sm 150.36 2 8 18 24 8 2 6 Solid Lanthanides Europium 63 Eu 151.964 2 8 18 25 8 2 6 Solid Lanthanides Gadolinium 64 Gd 157.25 2 8 18 25 9 2 6 Solid Lanthanides Terbium 65 Tb 158.92534 2 8 18 27 8 2 6 Solid Lanthanides Dysprosium 66 Dy 162.5 2 8 18 28 8 2 6 Solid Lanthanides Holmium 67 Ho 164.93032 2 8 18 29 8 2 6 Solid Lanthanides Erbium 68 Er 167.26 2 8 18 30 8 2 6 Solid Lanthanides Thulium 69 Tm 168.93421 2 8 18 31 8 2 6 Solid Lanthanides Ytterbium 70 Yb 173.04 2 8 18 32 8 2 6 Solid Lanthanides Lutetium 71 Lu 174.967 2 8 18 32 9 2 6 Solid Lanthanides Thorium 90 Th 232.0381 2 8 18 32 18 10 2 7 Solid Actinides Protactinium 91 Pa 231.03588 2 8 18 32 20 9 2 7 Solid Actinides Uranium 92 U 238.0289 2 8 18 32 21 9 2 7 Solid Actinides Neptunium 93 Np 237 2 8 18 32 22 9 2 7 Solid Actinides Plutonium 94 Pu 244 2 8 18 32 24 8 2 7 Synthetic Actinides Americium 95 Am 243 2 8 18 32 25 8 2 7 Synthetic Actinides Curium 96 Cm 247 2 8 18 32 25 9 2 7 Synthetic Actinides Berkelium 97 Bk 247 2 8 18 32 26 9 2 7 Synthetic Actinides Californium 98 Cf 251 2 8 18 32 28 8 2 7 Synthetic Actinides Einsteinium 99 Es 252 2 8 18 32 29 8 2 7 Synthetic Actinides Fermium 100 Fm 257 2 8 18 32 30 8 2 7 Synthetic Actinides Mendelevium 101 Md 258 2 8 18 32 31 8 2 7 Synthetic Actinides Nobelium 102 No 259 2 8 18 32 32 8 2 7 Synthetic Actinides Lawrencium 103 Lr 262 2 8 18 32 32 8 3 7 Synthetic Actinides