Polyatomic Ions

Cation:

Positive ion.

Anion:

Negative ion.

NH4+

Ammonium ion

CN-

Cyanide ion - Group 4A

CH3CO2-

Acetate ion - Group 4A

CO32-

Carbonate ion - Group 4A

HCO3-

Hydrogen Carbonate ion (Bicarbonate ion) - Group 4A

NO2-

Nitrite ion - Group 5A

NO3-

Nitrate ion - Group 5A

PO43-

Phosphate ion - Group 5A

HPO42-

Hydrogen Phosphate ion - Group 5A

H2PO4-

Dihydrogen Phosphate ion - Group 5A

OH-

Hydroxide ion - Group 6A

SO32-

Sulfite ion - Group 6A

SO42-

Sulfate ion - Group 6A

HSO4-

Hydrogen Sulfate ion (Bisulfate ion) - Group 6A

ClO-

Hypochlorite ion - Group 7A

ClO2-

Chlorite ion - Group 7A

ClO3-

Chlorate ion - Group 7A

ClO4-

Perchlorate ion - Group 7A

CrO42-

Chromate ion - Transition element

Cr2O72-

Dichromate ion - Transition element

MnO4-

Permanganate ion - Transition element