The atomic mass of chlorine is neither 35u nor 37u, rather its atomic mass is
35.5u.Give reason to support your answer.
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The answer to why chlorine has an atomic weight of 35.5 not 35 is because of something called isotopes. Isotopes are atoms with the same number of protons (in the case of chlorine that means 17 protons) but different numbers of neutrons
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