What happens when a chlorine atoms gains an electron? select one: a. the ion has a -1 charge b. a chloride ion is formed c. the ion becomes an anion d. all of the answer choices

A.) the ion has a -1 charge.

 If you add an electron, as is the case with chlorine, you upset the balance between the positive and negative charges.  There are 18 electrons and 17 protons, so the chlorine atom has become a charged chlorine ion with a charge of negative one (-1).

The answer is !