Question

Complete the chemical change. _______ + e - → Cl-

Answer 1

You are left with a chloride ion, so you started off with a chlorine atom.
Cl + e- → Cl-

Answer 2

Cl + e- → Cl-

Step-by-step explanation:

The electrically neutral chlorine has 17 protons and 17 electrons, 7 of which are in its outer energy level. When an electron is added to a chlorine atom to complete its outer energy level it has more electrons than electrons. Electrons are negative and that is why the charge of chlorine becomes -1