Common Polyatomic Ions

Fill-in-the-blank practice cards covering common polyatomic ions grouped by charges (+1, -1, -2, and -3), including their names, formulas, and alternate names.

The chemical formula for the ammonium ion with a +1 charge is __________.

$$NH_4^+$$

The polyatomic ion with the formula $C_2H_3O_2^-$ is named __________.

acetate

The chemical formula for the cyanide ion (-1 charge) is __________.

$$CN^-$$

The polyatomic ion with the formula $OH^-$ is named __________.

hydroxide

The chemical formula for the permanganate ion is __________.

$$MnO_4^-$$

The chlorine-containing polyatomic ion with the formula $ClO^-$ is named __________.

hypochlorite

The chemical formula for the chlorite ion is __________.

$$ClO_2^-$$

The polyatomic ion with the formula $ClO_3^-$ is named __________.

chlorate

The chemical formula for the perchlorate ion is __________.

$$ClO_4^-$$

The nitrogen-containing polyatomic ion with the formula $NO_2^-$ is named __________.

nitrite

The chemical formula for the nitrate ion is __________.

$$NO_3^-$$

The polyatomic ion with the formula $H_2PO_4^-$ is named __________.

dihydrogen phosphate

The polyatomic ion $HCO_3^-$ is named hydrogen carbonate or __________.

bicarbonate

The polyatomic ion $HSO_3^-$ is named hydrogen sulfite or __________.

bisulfite

The chemical formula for hydrogen sulfate (also known as bisulfate) is __________.

$$HSO_4^-$$

The polyatomic ion with the formula $CrO_4^{2-}$ is named __________.

chromate

The chemical formula for the dichromate ion is __________.

$$Cr_2O_7^{2-}$$

The polyatomic ion with a -2 charge having the formula $O_2^{2-}$ is named __________.

peroxide

The chemical formula for the hydrogen phosphate ion (-2 charge) is __________.

$$HPO_4^{2-}$$

The polyatomic ion with the formula $CO_3^{2-}$ is named __________.

carbonate

The chemical formula for the sulfite ion is __________.

$$SO_3^{2-}$$

The polyatomic ion with the formula $SO_4^{2-}$ is named __________.

sulfate

The chemical formula for the phosphate ion (-3 charge) is __________.

$$PO_4^{3-}$$