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Appendix Four 321
Atomic number Element Symbol Atomic weight Atomic number Element Symbol Atomic weight
71 Lutetium Lu 174.97 91 Protactinium* Pa 231.04
72 Hafnium Hf 178.49 92 Uranium* U 238.03
73 Tantalum Ta 180.95 93 Neptunium* Np 237
74 Tungsten W 183.85 94 Plutonium* Pu 244
75 Rhenium Re 186.21 95 Americium* Am 243
76 Osmium Os 190.2 96 Curium* Cm 247
77 Iridium Ir 192.22 97 Berkelium* Bk 247
78 Platinum Pt 195.09 98 Californium* Cf 251
79 Gold Au 196.97 99 Einsteinium* Es 254
80 Mercury Hg 200.59 100 Fermium* Fm 253
81 Thallium Tl 204.37 101 Mendelevium* Md 256
82 Lead Pb 207.19 102 Nobelium* No 253
83 Bismuth Bi 208.98 103 Lawrentium* Lw 257
84 Polonium* Po 209
85 Astatine* At 210 * Radioactive element.
86 Radon* Rn 222
87 Francium* Fr 223
88 Radium* Ra 226.03
89 Actinium* Ac 227.03
90 Thorium* Th 232.04
