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