Atomic Weights and Isotopic Compositions for Thallium
 Isotope   Relative
Atomic Mass 		    Isotopic
  Composition  		 Standard
Atomic Weight 		  Notes 
 
81 Tl 203 202.972 3446(14)   0.2952(1)  [204.382, 204.385]  
205 204.974 4278(14)   0.7048(1)

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