45 polyatomic ions (first 25)

hydrogen carbonate/bicarbonate

hydrogen carbonate/bicarbonate

HCO3^-1

hydrogen sulfate/bisulfate

HSO4^-1

hydrogen sulfite/bisulfite

HSO3^-1

monohydrogen phosphate

HPO4^-2

dihydrogen phosphate

H2PO4^-1

hydrogen oxalate/binoxalate

HC2O4^-1

hydrogen phthalate/biphthalate

HC8H4O4^-1

thiocyanate

SCN^-1

thiosulfate

S2O3^-2

nitrate

NO3^-1

nitrite

NO2^-1

perchlorate

ClO4^-1

chlorate

ClO3^-1

chlorite

ClO2^-1

hypochlorite

ClO^-1

perbromate

BrO4^-1

bromate

BrO3^-1

bromite

BrO2^-1

hypobromite

BrO^-1

periodate

IO4^-1

iodate

IO3^-1

hypoiodite

IO^-1

permanganate

MnO4^-1

manganate

MnO3^-1

cyanate

OCN^-1

ammonium

NH4+

Iodite

Io2^-1