Inorganic Nomenclature

Important Polyatomic Ions

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Nomenclature Rules

Polyatomic Ions

Periodic Table

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	Name	Formula
positive ion	ammonium	NH₄⁺

negative ions (1–)	cyanide	CN^-
	hydroxide	OH^-
	nitrate	NO₃^-
	chlorate	ClO₃^-
	hydrogen carbonate	HCO₃^-
	acetate	C₂H₃O₂^-

negative ions (2–)	sulfate	SO₄^2-
	sulfite	SO₃^2-
	carbonate	CO₃^2-

negative ion (3–)	phosphate	PO₄^3-