Why is mass number of Hydrogen 1 and chlorine 35.5
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Answer 1: The answer to why chlorinehas an atomic weight of 35.5 not 35 is because of something called isotopes. Isotopes are atoms with the samenumber of protons (in the case ofchlorine that means 17 protons) but different numbers of neutrons.Chlorine has two common isotopes,Chlorine-35 and Chlorine-37.
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