why is this the relative atomic mass of chlorine not a whole numberplease answer it in english

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why is this the relative atomic mass of chlorine not a whole numberplease answer it in english
why is this the relative atomic mass of chlorine not a whole number
please answer it in english

why is this the relative atomic mass of chlorine not a whole numberplease answer it in english
We don't round it to a whole number because we want the number of the relative atomic mass of cholorine to be as precise as possible.We really care about the significant figures,so it's better if we get more digits.