Oxidation number of bromine in sequence in Br3O8 is:
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Br3O8 is a tribromooctaoxide. The two Br at the terminal, have 3 oxygen atom attached, hence it's oxidation number is +6. The Br atom in the center have 2 oxygen atoms attached ,so it's oxidation state is +4. Hence, +6, 4+ 6 is the sequence.
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