Atomic Weights and Isotopic Compositions for Europium
 Isotope   Relative
Atomic Mass 		    Isotopic
  Composition  		 Standard
Atomic Weight 		  Notes 
 
63 Eu 151 150.919 8578(18)   0.4781(6)  151.964(1) g
153 152.921 2380(18)   0.5219(6)

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