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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 >
The electronic configuration of chlorine atom is:-E.C - K L M 2 8 7 Where k, l, ,m are the shells/orbits/ energy levels of an chlorine atom. Valence electrons are the number of electrons present in the outermost shell of an atom. Now, the last shell of chlorine atom has 7 electrons in it.