Actually there are a few KBrO3 or NaBrO3 etc - in the bromate ion, bromine is in oxidation state +7
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Bromine can have an oxidation number of +7 in compounds such as bromine heptafluoride (BrF7).
The oxidation number of Al in Al2Br6 is +3. Each bromine atom has an oxidation number of -1, and since the compound is neutral, the sum of the oxidation numbers must equal zero. Hence, each Al atom must have an oxidation number of +3 to balance the -6 from the bromine atoms.
In the compound H2S, hydrogen has an oxidation number of +1, and sulfur has an oxidation number of -2.
In the compound Al₂O₃, aluminum has an oxidation number of +3, and oxygen has an oxidation number of -2. This gives a total charge of zero for the compound, as it should be electrically neutral.
-2
Hydrogen can have an oxidation number of +1 when it forms a compound with nonmetals. Oxygen can have an oxidation number of -1 when it forms a peroxide compound, like hydrogen peroxide (H2O2).