How could cl change to gain stability? lose 7 electrons gain one electron

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 rather than lose 7 electrons to gain noble gas configuration and form chloride ion with -1 charge.