Chloride is an ion that carries a negative charge (anion) and is formed when the element chlorine gains an electron.
An ion with more electrons than protons, giving it a net negative charge.
The amount of energy released or spent when an electron is added to a neutral atom to form a negatively charged ion.
Any element in group 17 of the periodic table which includes fluorine, chlorine, bromine, iodine and astatine. They are known for their ability to gain electrons and form negative ions.