Cations:        Positively charged ions are called Cation.

Anions:          Negatively charged one calls Anions.

Note:

An ionic compound contains anions and cations such number that the compound is electrically neutral Metal atoms generally lose one or more electrons and form cations.

Examples:

For example, Na forms Na⁺ by losing one electron, Ca forms Ca⁺² by losing two electrons The Non-metal atoms usually a one or more electrons and form anions.

Examples:

For example, chlorine atom gains one electron and forms Cl^- ion O- atom gain two electrons and forms O² ions.