Atomic Weights and Isotopic Compositions for Rubidum
 Isotope   Relative
Atomic Mass
 
   Isotopic
  Composition  
Standard
Atomic Weight
 
 Notes 
 
37 Rb 85   84.911 789 7379(54)   0.7217(2)    85.4678(3) g
87   86.909 180 5310(60)   0.2783(2)

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