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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 >
Gaining an electron will make the element negative. The oxidation number for Cl, or Chlorine, is Cl-1. The element is in the seventh element on the Periodic Table, which means that it has seven outer shell electrons.. Since the element wants to become stable, and it only it needs 8 valence electrons. So therefore, it has to gain one electrons.