Question

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

Answer 1

Chlorine must obtain an electron from another atom to become negative.

Answer 2

Answer: gain one electron

Step-by-step 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:

`[Cl]=1s^22s^22p^63s^23p^5`

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

`[Cl^-]=1s^22s^22p^63s^23p^6`