Ionic compounds are made of ions.

Binary ionic compounds made of a metal and a non-metal, for example, TiO₂, Ca₃N₂, Na₂S and AlBr₃.

Ionic compounds can also include polyatomic ions, for example, Li₃PO₄, CH₃COONa, KOH, CaSO₃, V(NO₃)₃, KClO₂, NH₄OH and (NH₄)₃PO₃.