← Polyatomic Ions to memorize Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All NH₄⁺ ammonium OH⁻ hydroxide NO₃⁻ nitrate C₂H₃O₂⁻ acetate ClO₃⁻ chlorate CN⁻ cyanide HCO₃⁻ bicarbonate CO₃²⁻ carbonate SO₄²⁻ sulfate CrO₄²⁻ chromate Cr₂O₇²⁻ dichromate PO₄³⁻ phosphate