Common Cations and Anions

Vocabulary flashcards for polyatomic cations and anions with their chemical formulas.

Ammonium

A cation with the formula $\text{NH}_4^+$

Hydronium

A cation with the formula $\text{H}_3\text{O}^+$

Acetate

An anion with the formula $\text{CH}_3\text{COO}^-$ or $\text{C}_2\text{H}_3\text{O}_2^-$

Cyanide

An anion with the formula $\text{CN}^-$

Hydroxide

An anion with the formula $\text{OH}^-$

Hypochlorite

An anion with the formula $\text{ClO}^-$

Chlorite

An anion with the formula $\text{ClO}_2^-$

Chlorate

An anion with the formula $\text{ClO}_3^-$

Perchlorate

An anion with the formula $\text{ClO}_4^-$

Nitrite

An anion with the formula $\text{NO}_2^-$

Nitrate

An anion with the formula $\text{NO}_3^-$

Permanganate

An anion with the formula $\text{MnO}_4^-$

Carbonate

An anion with the formula $\text{CO}_3^{2-}$

Hydrogen carbonate

An anion with the formula $\text{HCO}_3^-$ (also known as bicarbonate)

Chromate

An anion with the formula $\text{CrO}_4^{2-}$

Dichromate

An anion with the formula $\text{Cr}_2\text{O}_7^{2-}$

Peroxide

An anion with the formula $\text{O}_2^{2-}$

Phosphate

An anion with the formula $\text{PO}_4^{3-}$

Hydrogen phosphate

An anion with the formula $\text{HPO}_4^{2-}$

Dihydrogen phosphate

An anion with the formula $\text{H}_2\text{PO}_4^-$

Sulfite

An anion with the formula $\text{SO}_3^{2-}$

Sulfate

An anion with the formula $\text{SO}_4^{2-}$

Hydrogen sulfate

An anion with the formula $\text{HSO}_4^-$