Atomic Weights and Isotopic Compositions for Chlorine
Column Descriptions

                                                                         
             Relative           Isotopic      Standard                   
Isotope      Atomic Mass        Composition   Atomic Weight    Notes     
_________________________________________________________________________
17  Cl  35   34.968852682(37)   0.7576(10)    [35.446,35.457]  m
        37   36.965902602(55)   0.2424(10)  
_________________________________________________________________________

NIST | Physical Measurement Laboratory | Physical Reference Data | Atomic Weights and Isotopic Compositions Main Page