Atomic Weights and Isotopic Compositions for Gadolinium
 Isotope   Relative
Atomic Mass
 
   Isotopic
  Composition  
Standard
Atomic Weight
 
 Notes 
 
64 Gd 152 151.919 7995(18)   0.0020(1)  157.25(3) g
154 153.920 8741(17)   0.0218(3)
155 154.922 6305(17)   0.1480(12)
156 155.922 1312(17)   0.2047(9)
157 156.923 9686(17)   0.1565(2)
158 157.924 1123(17)   0.2484(7)
160 159.927 0624(18)   0.2186(19)

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