Formulas and Names of Common Polyatomic Ions

Vocabulary flashcards covering formulas and names of common polyatomic ions from Table 2.2.

Ammonium

A polyatomic cation with the formula $NH_4^+$.

Mercury(I)

A polyatomic cation with the formula $Hg_2^{2+}$.

Acetate

A polyatomic anion with the formula $C_2H_3O_2^-$ (also written $CH_3CO_2^-$).

Cyanide

A polyatomic anion with the formula $CN^-$.

Cyanate

A polyatomic anion with the formula $OCN^-$.

Thiocyanate

A polyatomic anion with the formula $SCN^-$.

Hydrogen carbonate (bicarbonate)

A polyatomic anion with the formula $HCO_3^-$.

Carbonate

A polyatomic anion with the formula $CO_3^{2-}$.

Hypochlorite

A polyatomic anion with the formula $ClO^-$.

Chlorite

A polyatomic anion with the formula $ClO_2^-$.

Chlorate

A polyatomic anion with the formula $ClO_3^-$.

Perchlorate

A polyatomic anion with the formula $ClO_4^-$.

Chromate

A polyatomic anion with the formula $CrO_4^{2-}$.

Dichromate

A polyatomic anion with the formula $Cr_2O_7^{2-}$.

Permanganate

A polyatomic anion with the formula $MnO_4^-$.

Nitrite

A polyatomic anion with the formula $NO_2^-$.

Nitrate

A polyatomic anion with the formula $NO_3^-$.

Hydroxide

A polyatomic anion with the formula $OH^-$.

Peroxide

A polyatomic anion with the formula $O_2^{2-}$.

Dihydrogen phosphate

A polyatomic anion with the formula $H_2PO_4^-$.

Hydrogen phosphate

A polyatomic anion with the formula $HPO_4^{2-}$.

Phosphate

A polyatomic anion with the formula $PO_4^{3-}$.

Sulfite

A polyatomic anion with the formula $SO_3^{2-}$.

Polyatomic Ion Naming Patterns

Identifiable nomenclature patterns where related polyatomic ions contain the same element (such as chlorine or nitrogen) but varying numbers of oxygen atoms.