2.3 Nomenclature of Ionic Compounds

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Naming Ionic Compounds

1. Name the cation (metal or polyatomic cation).

2. State the metal’s oxidation state as a roman numeral in parenthesis.

(except Group I/II metals, Al³⁺, Zn²⁺, Cd²⁺, Ag⁺)

3. Name the non-metal with an -ide ending (or name the polyatomic anion).

Polyatomic Ions

SO₄^2- sulfate
SO₃^2- sulfite
NO₃^- nitrate
NO₂^- nitrite
PO₄^3- phosphate
CO₃^2- carbonate
HCO₃^- bicarbonate
OH^- hydroxide
MnO₄^- permanganate
CrO₄^2- chromate
Cr₂O₇^2- dichromate
NH₄⁺ ammonium
CN^- cyanide

ClO^- hypochlorite
ClO₂^- chlorite
ClO₃^- chlorate
ClO₄^- perchlorate

(for Br and I also)