Polyatomic Ion Memory List

acetate ion

C2H3O2^-

ammonium ion

NH4^+

carbonate ion

CO3^2-

chlorate ion

ClO3^-

chlorite ion

ClO2^-

chromate ion

CrO4^2-

cyanide ion

CN^-

dichromate ion

Cr2O7^2-

dihydrogen phosphate

H2PO4^-

hydrogen carbonate ion (aka bicarbonate)

HCO3^-

hydrogen phosphate (aka biphosphate)

HPO4^2-

hydrogen sulfate ion (aka bisulfate)

HSO4^-

hydroxide ion

OH^-

hypochlorite ion

ClO^-

iodate

IO3^-

nitrate ion

NO3^-

nitrite ion

NO2^-

oxalate ion

C2O4^2-

perchlorate ion

ClO4^-

permanganate ion

MnO4^-

peroxide ion

O2^2-

phosphate ion

PO4^3-

phosphite ion

PO3^3-

Sulfate ion

SO4^2-

Sulfite ion

SO3^2-

Thiocyanate

SCN^-

Silver ion

Ag^+

Zinc ion

Zn^2+

Copper (I) ion

Cu^+

Copper (II) ion

Cu^2+

Iron (II) ion

Fe^2+

Iron (III) ion

Fe^3+

Lead (II) ion

Pb^2+

Lead (IV) ion

Pb^4+

mercury (I) ion

Hg2^2+

mercury (II) ion

Hg^2+

Tin (II) ion

Sn^2+

Tin (IV) ion

Sn^4+