Correcto, NO₃⁻, SO₄²⁻, PO₄³⁻, OH⁻, O²⁻, HCO₃⁻, CO₃²⁻, NH₄⁺, Incorrecto, NaCl, H₂O, CO₂, MgO, CaCl₂, NH₃

polyatomic ions

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