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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 >
Sodium is an alkali metal, and chlorine is a halogen. This means that sodium contains one electron in its outer orbital and chlorine contains seven electrons in its outer orbital. One electron moves from the sodium atom and attaches to the chlorine atom to fill its outer orbital.