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This is an oxidation-reduction (redox) reaction:

2 Br0 - 8 e- → 2 BrIV (oxidation)

4 O0 + 8 e- → 4 O-II (reduction)

Br2 is a reducing agent, O2 is an oxidizing agent.

Input interpretation

Br2      +     O2     →   Bro2-

Bromine  oxygen   bromite anion