Atomic Weights and Isotopic Compositions for Osmium
 Isotope   Relative
Atomic Mass
 
   Isotopic
  Composition  
Standard
Atomic Weight
 
 Notes 
 
76 Os 184 183.952 4885(14)   0.0002(1)  190.23(3) g
186 185.953 8350(16)   0.0159(3)
187 186.955 7474(16)   0.0196(2)
188 187.955 8352(16)   0.1324(8)
189 188.958 1442(17)   0.1615(5)
190 189.958 4437(17)   0.2626(2)
192 191.961 4770(29)   0.4078(19)

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