Chlorine forms the chloride ion to bond with many metals. to become a chloride ion with a -1 charge, a chlorine atom must

gain one electron

Explanation:

Chlorine is an element with atomic number 17 and thus contain 17 electrons. It is a p block element as the last electron enters the p orbital.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration of chlorine is:

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

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