polyatomic atoms

dihydrogen phosphate

H2PO4-

1-

ethanoate

C2H3O2-

1-

Hydrogen sulfite

HSO3-

1-

Hydrogen sulfate

HSO4-

1-

Hydrogen carbonate

HCO3-

1-

Nitrite

NO2-

1-

Nitrate

NO3-

Cyanide

CN-

1-

Hydroxide

OH-

1-

Permanganate

MnO4-

1-

Hypochlorite

CIO-

1-

Clorite

CIO2-

1-

Chlorate

CIO3-

1-

Perchlorate

CIO4-

1-

Hydrogen phosphate

HPO4²-

2-

Oxalate

C2O4²-

2-

Sulfite

SO3²-

2-

Sulfate

SO4²-

2-

Carbonate

CO3²-

2-

Chromate

CrO4²-

2-

Dichromate

Cr2O7²-

2-

Silicate

SiO3²-

2-

Phosphite

PO3³-

3-

Phosphate

PO4³-

3-

Ammonium

NH4^+

1+