Periodic Table of the Elements Group number→1A 8 Key H 67 1.0079 He 2 Atomic numbe Ho Symbol 3A 4A 7A 164.92 Atomic weight An element B c 型 ● 三 N 3B 48 5B 6B 7B 8B 8B 8B 1B 29 T Y Co N 兰 7 S 三 型 Rh Ca 2 n·T 5日 7 2 2 27 28 2B4 Lanthanides 6 Ce Nd Pm Sm Gd Tb Ho Er Tm b Lu 器 50 97 94 95 97 8 00 101 102 Actinide Th Pa Am Bk Es Fm Md 310359 24 25jPeriod number Group number Lanthanides Actinides Key 1 1 1 H Hydrogen 1.0079 67 Ho Holmium 164.9303 86 Rn Radon (222) 54 Xe Xenon 131.29 36 Kr Krypton 83.80 18 Ar Argon 39.948 10 Ne Neon 20.1797 53 I Iodine 126.9045 35 Br Bromine 79.904 17 Cl Chlorine 35.4527 9 F Fluorine 18.9984 34 Se Selenium 78.96 16 S Sulfur 32.066 8 O Oxygen 15.9994 15 P Phosphorus 30.9738 7 N Nitrogen 14.0067 6 C Carbon 12.011 2 He Helium 4.0026 2 3 Li Lithium 6.941 3 11 Na Sodium 22.9898 4 19 K Potassium 39.0983 5 2 3 4 5 37 Rb Rubidium 85.4678 6 55 Cs Cesium 132.9054 7 87 Fr Francium (223) 4 Be Beryllium 9.0122 12 Mg Magnesium 24.3050 20 Ca Calcium 40.078 38 Sr Strontium 87.62 56 Ba Barium 137.327 88 Ra Radium (226) 21 Sc Scandium 44.9559 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B 39 Y Yttrium 88.9059 22 Ti Titanium 47.88 40 Zr Zirconium 91.224 72 Hf Hafnium 178.49 104 Rf Rutherfordium (267) 23 V Vanadium 50.9415 41 Nb Niobium 92.9064 73 Ta Tantalum 180.9479 105 Db Dubnium (268) 24 Cr Chromium 51.9961 42 Mo Molybdenum 95.94 74 W Tungsten 183.84 106 Sg Seaborgium (271) 25 Mn Manganese 54.9380 43 Tc Technetium (98) 76 Os Osmium 190.2 107 Bh Bohrium (272) 26 Fe Iron 55.845 44 Ru Ruthenium 101.07 77 Ir Iridium 192.22 108 Hs Hassium (270) 27 Co Cobalt 58.9332 45 Rh Rhodium 102.9055 78 Pt Platinum 195.08 109 Mt Meitnerium (276) 28 Ni Nickel 58.693 46 Pd Palladium 106.42 79 Au Gold 196.9665 110 Ds Darmstadtium (281) 29 Cu Copper 63.546 47 Ag Silver 107.8682 80 Hg Mercury 200.59 111 Rg Roentgenium (280) 3A 4A 5A 6A 7A 8A 30 Zn Zinc 65.41 48 Cd Cadmium 112.411 81 Tl Thallium 204.3833 112 – — (285) 31 Ga Gallium 69.723 13 Al Aluminum 26.9815 49 In Indium 114.82 50 Sn Tin 118.710 82 Pb Lead 207.2 83 Bi Bismuth 208.9804 114 – — (289) 84 Po Polonium (209) 6 58 Ce Cerium 140.115 7 6 7 6 7 90 Th Thorium 232.0381 59 Pr Praseodymium 140.9076 91 Pa Protactinium 231.0359 60 Nd Neodymium 144.24 92 U Uranium 238.0289 61 Pm Promethium (145) 93 Np Neptunium (237) 62 Sm Samarium 150.36 94 Pu Plutonium (244) 63 Eu Europium 151.964 95 Am Americium (243) 64 Gd Gadolinium 157.25 96 Cm Curium (247) 65 Tb Terbium 158.9253 97 Bk Berkelium (247) 66 Dy Dysprosium 162.50 98 Cf Californium (251) 67 Ho Holmium 164.9303 99 Es Einsteinium (252) 68 Er Erbium 167.26 100 Fm Fermium (257) 69 Tm Thulium 168.9342 101 Md Mendelevium (258) 70 Yb Ytterbium 173.04 102 No Nobelium (259) 71 Lu Lutetium 174.967 103 Lr Lawrencium (260) 75 Re Rhenium 186.207 116 – — (293) 5 B Boron 10.811 14 Si Silicon 28.0855 32 Ge Germanium 72.64 33 As Arsenic 74.9216 51 Sb Antimony 121.760 52 Te Tellurium 127.60 85 At Astatine (210) 57 La Lanthanum 138.9055 89 Ac Actinium (227) 1A 2A Atomic number Name An element Symbol Atomic weight Periodic Table of the Elements 113 – — (284) 115 – — (288) smi75625_endppFRONT.indd 2 12/2/09 10:14:16 AM