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Answer:

Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. The chemical symbol for Chlorine is Cl. Neutron Number and Mass Number of Chlorine Mass numbers of typical isotopes of Chlorine are 35; 37.

Explanation:
Mass number: 35.453u
Atomic number(#of protons): 17

To get the number of neutrons you must subtract the atomic number (#of protons) from the atomic mass which is 35.
35-17=18

Therefore the number of neutrons is 18.

This is because each proton and neutron have a relative mass of one unit.

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