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    Why does chlorine have two relative atomic masses
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    As it is derived from 2 common isotopes with 2 relative atomic masses, as opposed to just the one (Chlorine 35 and Chlorine 37). Both are common in nature (roughly 75% Chlorine 35 and 25% Chlorine 37).

    As the relative atomic masses is the weighted average of ALL isotopes in the Chlorine, you'd have:

    Relative Atomic Mass = (75/100 x 35) + (25/100 x 37) = 35.5.
 
 
 
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