ions with a -1 charge

Perchlorate ion

ClO4^-

Chlorate ion

ClO3^-

Chlorite ion

ClO2^-

Hypochlorite ion

ClO^-

Hydrogen carbonate ion

HCO3^-

Nitrate ion

NO3^-

Nitrite ion

NO2^-

Hydrogen sulfate ion

HSO4^-

Hydrogen sulfite ion

HSO3^-

Dihydrogen phosphate ion

H2PO4^-

Acetate ion

C2H3O2^-

Cyanide ion

CN^-

Hydroxide ion

OH^-

Permanganate ion

MnO4^-