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)