Atomic Weights and Isotopic Compositions for Silicon
 Isotope   Relative
Atomic Mass 		    Isotopic
  Composition  		 Standard
Atomic Weight 		  Notes 
 
14 Si 28   27.976 926 534 65(44)   0.922 23(19)  [28.084, 28.086]  
29   28.976 494 664 90(52)   0.046 85(8)
30   29.973 770 136(23)   0.030 92(11)

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