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Polyatomic ions
| Term | Definition |
|---|---|
| hydroxide | OH- |
| cyanide | CN- |
| nitrite | NO2- |
| nitrate | NO3- |
| chlorate | ClO3- |
| chlorite | ClO2- |
| hypochlorite | ClO- |
| perchlorate | ClO4- |
| iodate | IO3- |
| periodate | IO4- |
| bromate | BrO3- |
| permanganate | MnO4- |
| thiocyanate | SCN- |
| bisulfate | HSO4- |
| bisulfite | HSO3- |
| bicarbonate | HCO3- |
| acetate | C2H3O2-/CH3COO- |
| sulfite | SO3(2-) |
| sulfate | SO4(2-) |
| carbonate | CO3(2-) |
| chromate | CrO4(2-) |
| dichromate | Cr2O7(2-) |
| silicate | SiO3(2-) |
| peroxide | O2(2-) |
| selenate | SeO4(2-) |
| tartarate | C4H4O6(2-) |
| molybdate | MoO4(2-) |
| tetraborate | B4O7(2-) |
| thiosulfate | S2O3(2-) |
| oxalate | C2O4(2-) |
| phosphate | PO4(3-) |
| phosphite | PO3(3-) |
| ferricyanide | Fe(CN)6(4-) |
| ammonium | NH4+ |