How Many Protons Does Chlorine Have?


Quick Answer

Chlorine has exactly 17 protons. The element has an atomic number of 17, which correlates with its number of protons and electrons. Chlorine has 18 neutrons.

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Full Answer

Chlorine has an atomic mass of 35.4 atomic mass units. The element's atomic mass is equal to the atomic number plus the number of neutrons, or it is equal to the number of protons plus the number of neutrons. The element is classified as a halogen, and it has a chemical symbol of Cl. It has a total of three energy levels in which all of its electrons reside to keep the atom active.

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