How many neutrons does chlorine have?

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Multiple Choice

How many neutrons does chlorine have?

Explanation:
Neutrons are found by subtracting the number of protons (the atomic number) from the mass number of the atom. Chlorine has 17 protons. The most common chlorine isotope has a mass number of 35, so it has 35 − 17 = 18 neutrons. (There’s also a less abundant isotope with mass 37, which would have 20 neutrons.) The average atomic mass of chlorine is about 35.45, reflecting both isotopes, but the typical count tied to the common isotope is 18.

Neutrons are found by subtracting the number of protons (the atomic number) from the mass number of the atom. Chlorine has 17 protons. The most common chlorine isotope has a mass number of 35, so it has 35 − 17 = 18 neutrons. (There’s also a less abundant isotope with mass 37, which would have 20 neutrons.) The average atomic mass of chlorine is about 35.45, reflecting both isotopes, but the typical count tied to the common isotope is 18.

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