Atomic Weights and Isotopic Compositions for Erbium
 Isotope   Relative
Atomic Mass
 
   Isotopic
  Composition  
Standard
Atomic Weight
 
 Notes 
 
68 Er 162 161.928 7884(20)   0.001 39(5)  167.259(3) g
164 163.929 2088(20)   0.016 01(3)
166 165.930 2995(22)   0.335 03(36)
167 166.932 0546(22)   0.228 69(9)
168 167.932 3767(22)   0.269 78(18)
170 169.935 4702(26)   0.149 10(36)

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