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How many electrons, protons and neutrons does chlorine have? A: The chemical element chlorine has 17 electrons, 17 protons and 18 neutrons. An atom, which is the fundamental unit of an element, contains an equal number ... Full Answer >
1 Chlorine (Cl) is a halogen; it is a highly reactive element that readily gains an electron to fill its outermost shell. 2  Sodium and chlorine, two highly reactive elements, combine to form the stable compound sodium chloride (ordinary table salt).