Atomic Weights and Isotopic Compositions for Argon
 Isotope   Relative
Atomic Mass 		    Isotopic
  Composition  		 Standard
Atomic Weight 		  Notes 
 
18 Ar 36   35.967 545 105(28)   0.003 336(21)    39.948(1) g,r
38   37.962 732 11(21)   0.000 629(7)
40   39.962 383 1237(24)   0.996 035(25)

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