A bromide is a chemical compound containing a bromide ion or ligand. This is a bromine atom with an ionic charge of -1 (Br-); for example, in caesium bromide, caesium cations (Cs+) are electrically attracted to bromide anions (Br-) to form the electrically neutral ionic compound CsBr. The term "bromide" can also refer to a bromine atom with an oxidation number of -1 in covalent compounds such as sulfur dibromide (SBr2).