Atomic Weights and Isotopic Compositions for Hafnium
 Isotope   Relative
Atomic Mass
 
   Isotopic
  Composition  
Standard
Atomic Weight
 
 Notes 
 
72 Hf 174 173.940 0461(28)   0.0016(1)  178.49(2)  
176 175.941 4076(22)   0.0526(7)
177 176.943 2277(20)   0.1860(9)
178 177.943 7058(20)   0.2728(7)
179 178.945 8232(20)   0.1362(2)
180 179.946 5570(20)   0.3508(16)

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