polyatomics

Ammonium

NH₄⁺, with a charge of +1.

Hydronium

H₃O⁺, with a charge of +1.

Mercury(I)

Hg₂²⁺, with a charge of +2.

Hydroxide

OH⁻, an anion with a charge of -1.

Hypochlorite

ClO⁻, an anion with a charge of -1.

Chlorite

ClO₂⁻, an anion with a charge of -1.

Chlorate

ClO₃⁻, an anion with a charge of -1.

Perchlorate

ClO₄⁻, an anion with a charge of -1.

Nitrite

NO₂⁻, an anion with a charge of -1.

Nitrate

NO₃⁻, an anion with a charge of -1.

Hydrogen sulfate (bisulfate)

HSO₄⁻, an anion with a charge of -1.

Dihydrogen phosphate

H₂PO₄⁻, an anion with a charge of -1.

Hydrogen carbonate (bicarbonate)

HCO₃⁻, an anion with a charge of -1.

Cyanide

CN⁻, an anion with a charge of -1.

Thiocyanate

SCN⁻, an anion with a charge of -1.

Acetate

C₂H₃O₂⁻, an anion with a charge of -1.

Azide

N₃⁻, an anion with a charge of -1.

Peroxide

O₂²⁻, an anion with a charge of -2.

Oxalate

C₂O₄²⁻, an anion with a charge of -2.

Sulfite

SO₃²⁻, an anion with a charge of -2.

Sulfate

SO₄²⁻, an anion with a charge of -2.

Chromate

CrO₄²⁻, an anion with a charge of -2.

Dichromate

Cr₂O₇²⁻, an anion with a charge of -2.

Hydrogen phosphate

HPO₄²⁻, an anion with a charge of -2.

Carbonate

CO₃²⁻, an anion with a charge of -2.

Phosphate

PO₄³⁻, an anion with a charge of -3.

Phosphite

PO₃³⁻, an anion with a charge of -3.