Question

what is the mass number of chlorine

Answer 1

Chlorine have mass number of 35.5 amu.

Answer 2

Chlorine-35 and chlorine-37 are both isotopes of the element chlorine. The number after the name 'chlorine' is called the mass number. The mass number is a tally of the number of protons and the number of neutrons in an atom's nucleus.
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