Bromine can form several different unstable oxides: * Dibromine monoxide (Br2O) * Bromine dioxide (BrO2) * Dibromine trioxide (Br2O3) * Dibromine pentoxide (Br2O5) * Tribromine octoxide (Br3O8) Also, a number of ions are bromine oxides: * Hypobromite (BrO−) * Bromite (BrO2−) * Bromate (BrO3−) * Perbromate (BrO4−) And the bromine monoxide radical: * Bromine oxide (BrO)