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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 >
(1s# 2s# 2p# 3s# 3p# 4s# 3d# 4p# ... etc, where # is the number of electrons in that sublevel. A chlorine ion has 18 electrons (17 e- in a chlorine atom + 1 e- to form the chlorine anion having -1 charge). The shorthand electron configuration begins with the symbol of the noble gas having the closest lower atomic number (the noble gas in the row above the element that you are writing the configuration for). The noble gas you would use to write the configuration for the chlorine ion would be neon (Ne) which has an atomic number of 10.