21 5.2 Ionic compounds
The oxidation number of an ion or group equals its charge, with its sign: K⁺Br⁻ (K +1, Br −1), Na⁺Cl⁻, Mg²⁺O²⁻, Ca²⁺CO₃²⁻, Cu²⁺SO₄²⁻.
2 Ionic compounds
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