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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 >
A chlorine atom has the electron structure 2, 8, 7. Chlorine is a halogen. See a picture of a chlorine atom. Chlorine is in group 7 (7 electrons in its outer shell) and period 3 (3 shells). The electron structure is also called the electronic structure, the electron configuration or the electronic configuration.