polyatomic ions 1+/1-

Acetate

Acetate

C2H3O2- or CH3COO-

Perchlorate

ClO4-

Chlorate

ClO3-

Chlorite

ClO2-

Hypochlorite

ClO-

cyanide

CN-

hydrogen carbonate (bicarbonate)

HCO3-

dihydrogen phosphate

H2PO4-

hydrogen sulfate (bisulfate)

HSO4-

Permanganate

MnO4-

nitrate

NO3-

nitrite

NO2-

Hydroxide

OH-

Thiocyanate

SCN-

Ammonium

NH4+

An atom or group of atoms that has a positive or negative charge.

ion

may be used as a synonym for charge on an ion

oxidation number

an ion made from a single atom (Na+, sodium ion)

monatomic ion

an ion made from more than one atom (NO3-, nitrate ion)

polyatomic ion