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polyatomic ions
| formula | name |
|---|---|
| NH4+ | ammonium |
| H30+ | hydronium |
| CH3COO- or C2H3O2- | acetate |
| CN- | cyanide |
| OH- | hydroxide |
| ClO- | hypochlorite |
| ClO2- | chlorite |
| ClO3- | chlorate |
| ClO4- | perchlorate |
| NO2- | nitrite |
| NO3- | nitrate |
| MnO4- | permanganate |
| CrO4^2- | chromate |
| Cr2O7^2- | dichromate |
| CO3^2- | carbonate |
| HCO3^- | bicarbonate |
| O2^2- | peroxide |
| PO4^3- | phosphate |
| HPO4^2- | hydrogen phosphate |
| SO3^2- | sulfite |
| SO4^2- | sulfate |
| HSO4^- | bisulfate |