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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 >
On the periodic table, Phosphorus in group 5 or 15, 5 valence electrons; 6 for the Oxygen; and then 7 for Chlorine, we do have three Chlorines. If we add them up: 5 plus 6, 11; plus 21: 32 valence electrons. We'll take and put the Phosphorus at the center. It is the least electronegative.