31 Gallium Ga 69.9 69, 71 .. — 32 Germanium Ge 72.5 74, 72, 70 .. — 33 Arsenic As 74.96 75 .. — 34 Selenium Se 79.2 .. — 35 Bromine Br 79.92 79, 81 .. — 36 Krypton Kr 82.92 84, 86, 82, 83, 70, 78 .. — 37 Rubidium Rb 85.45 85, 87 .. * 38 Strontium Sr 87.63 88, 86 0.0065 * 39 Yttrium Y 88.7 89 0.0030 (with Ce) * 40 Zirconium Z 90.6 90, 92, 94 0.0095 * 41 Niobium Nb 93.1 .. ? 42 Molybdenum Mo 96 .. * 43 .. .. .. 44 Ruthenium Ru 101.7 .. * 45 Rhodium Rh 102.9 .. * 46 Palladium Pd 106.7 .. * 47 Silver Ag 107.88 107, 109 .. * 48 Cadmium Cd 112.40 110, 111, 112, 113, 114, 116 .. — 49 Indium In 114.8 .. — 50 Tin Sn 118.7 .. ? 51 Antimony Sb 120.2 .. — 52 Tellurium Te 127.5 126, 128, 130 .. — 53 Iodine I 126.92 127 .. — 54 Xenon Xe 130.2 129, 132, 131, 134, 136, (128, 130) .. — 55 Caesium Cs 132.81 133 .. * 56 Barium Ba 137.37 138 0.0098 * 57 Lanthanum La 139.0 139 .. * 58 Cerium Ce 140.25 140, 142 0.0030 (with Y) * 59 Praseodymium Pr 140.9 141 .. —[Pg 7] 60 Neodymium Nd 144.3 142-150 .. — 61 .. .. .. .. 62 Samarium Sa 150.4 .. — 63 Europium Eu 152.0 .. * 64 Gadolinium Gd 157.3 .. — 65 Terbium Tb 159.2 .. * 66 Dysprosium Dy 162.5 .. — 67 Holmium Ho 163.5 .. — 68 Erbium Er 167.7 .. — 69 Thulium Tm 168.5 .. — 70 Ytterbium Yb 173.5 .. — 71 Lutecium Lu 175.0 .. — 72 Hafnium Hf .. — 73 Tantalum Ta 181.5 .. — 74 Tungsten W 184.0 .. — 75 .. .. — 76 Osmium Os 190.9 .. — 77 Iridium Ir 193.1 .. — 78 Platinum Pt 195.2 .. — 79 Gold Au 197.2 .. — 80 Mercury Hg 200.6 (197, 198, 199, 200) 202, 204 .. — 81 Thallium Tl 204.0 .. — 82 Lead Pb 207.2 0.0002 * 83 Bismuth Bi 208.0 .. — 84 .. .. .. .. 85 .. .. .. .. 86 Radon Rd 222.4 .. — 87 .. .. .. .. 88 Radium Ra 226.0 .. — 89 .. .. .. .. 90 Thorium Th 232.4 .. — 91 .. .. .. ..