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The reaction of sodium (Na) with bromine (Br2) is a classic example of a redox reaction. Sodium, a highly reactive alkali metal, loses an electron to form a positively charged sodium ion (Na+). Bromine, a diatomic halogen, gains an electron to form two negatively charged bromide ions (Br-). The balanced chemical equation for this reaction is:
2Na + Br2 → 2NaBr