We’re being asked to determine the oxidation state of Br in BrO2–
The rules for oxidation states are as follows:
A. General Rules:
1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.) O.S. = 0
2. For an ion (Li+, Al3+, etc.) O.S. = charge
Determine the oxidation state (number) of bromine in BrO2- :
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