535
Appendix 1
Atomic Weights of Elements (Based on 12 C = 12.000)
Atomic Number
Name
Symbol
Atomic Weight
87
Francium
Fr
223.02
88
Radium
Ra
226.03
89
Actinium
Ac
227.03
90
Thorium
Th
232.04
91
Protoactinium
Pa
231.04
92
Uranium
U
238.03
93
Neptunium
Np
237.05
94
Plutonium
Pu
239.05
95
Americium
Am
241.06
96
Curium
Cm
244.06
97
Berkelium
Bk
249.08
98
Californium
Cf
251.07
99
Einsteinium
Es
252.08
100
Fermium
Fm
257.10
101
Mendelevium
Md
258.10
102
Nobelium
No
259.10
103
Lawrencium
Lr
262.11