Chromate ion
CrO4^-2
Carbonate ion
CO3^2-
Dichromate ion
Cr2O7^-2
Oxalate ion
C2O4^-2
Sulfite ion
SO3^-2
Sulfate ion
SO4^-2
Thiosulfate ion
S2O3^-2
Peroxide ion
O2^-2
Tartrate ion
C4H4O6^-2
Tetraborate ion
B4O7^-2
Hydrogen phosphate ion
HPO4^-2
Phosphate ion
PO4^-3
Ammonium ion
NH4+1
Hydronium ion
H3O+1