Common polyatomic ions and Cations

Ammonium

NH₄ +

Nitrite

NO₂ -

Nitrate

NO₃ -

Sulfite

SO₃ 2-

Sulfate

SO₄ 2-

Hydrogen sulfate (bisulfate)

HSO₄ -

Thiosulfate

S₂O₃ 2-

Oxalate

C₂O₄ 2-

Hydroxide

OH -

Phosphite

PO₃ 3-

phosphate

PO₄ 3-

Hydrogen phosphate

HPO₄ 2-

Dihydrogen phosphate

H₂PO₄ -

Perchlorate

ClO₄ -

Chlorate

ClO₃ -

Chlorite

ClO₂ -

Hypochlorite

ClO -

Bromate

BrO₃ -

Iodate

IO₃ -

Acetate

CH₃COO - or C₂H₃O₂ -

Carbonate

CO₃ 2-

Hydrogen carbonate (bicarbonate)

HCO₃ -

Chromate

CrO₄ 2-

Dichromate

Cr₂O₇ 2-

Permanganate

MnO₄ -

Peroxide

O₂ 2-

Cyanide

CN -

Cyanate

OCN -

Thiocyanate

SCN -

Aluminum

3+

Barium

2+B

Berylium

2+

Bismuth

3+

Cadmium

2+

Calcium

2+

Cesium

+

Chromium

2+, 3+

Cobalt

2+, 3+

Copper

+, 2+

Francium

+

Gold

Au +, 3+

Iron

2+, 3+

Lead

2+, 4+

Lithium

+

Magnesium

2+

Manganese

2+, 3+

Mercury

+, 2+

Nickle

2+, 3+

Potassium

+

Radium

2+

Rubidium

+S

Silver

Ag +

Sodium

+

Strontium

2+

Tin

Sn 2+, 4+

Titanium

Ti 3+, 4+

zinc

2+