Atomic Weights and Isotopic Compositions for Cerium
 Isotope   Relative
Atomic Mass 		    Isotopic
  Composition  		 Standard
Atomic Weight 		  Notes 
 
58 Ce 136 135.907 129 21(41)   0.001 85(2)  140.116(1) g
138 137.905 991(11)   0.002 51(2)
140 139.905 4431(23)   0.884 50(51)
142 141.909 2504(29)   0.111 14(51)

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