Bromine oxide

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)