AII-3 Symbol Name Atomic Number Atomic Weight Ac Actinium 89 1(227) Ag Silver 47 107.868 Al Aluminum 13 6.982 Am Americium 95 (243) Ar Argon 18 39.95 As Arsenic 33 74.922 At Astatine 85 (210) Au Gold 79 196.967 B Boron 5 10.81 Ba Barium 56 137.34 Be Beryllium 4 9.012 Bi Bismuth 83 208.980 Bk Berkelium 97 (247) Br Bromine 35 79.904 C Carbon 6 12.011 Ca Calcium 20 40.08 Cd Cadium 48 112.40 Ce Cerium 58 140.12 Cf Californium 98 (249) Cl Chlorine 17 35.453 Cm Curium 96 (247) Co Cobalt 27 58.933 Cr Chromium 24 51.996 Cs Cesium 55 132.905 Cu Copper 29 63.546 Dy Dysprosium 66 162.50 Es Einsteinium 99 (254) Er Erbium 68 167.26 Eu Europium 63 151.96 F Fluorine 9 18.998 Fe Iron 26 55.847 Fm Fermium 100 (257) Fr Francium 87 (223) Ga Gallium 31 69.72 Gd Gadolinium 64 157.25 Ge Germanium 32 72.59 H Hydrogen 1 1.008 Ha Hahnium 105 (262) He Helium 2 4.003 Hf Hafnium 72 178.49 Hg Mercury 80 200.59 Ho Holmium 67 164.930 I Iodine 53 126.904 Table AII-1.—Periodic Table of the Elements