Common polyatomic ions Helping students learn the chemical formula of a range of common polyatomic ions. Simple drag and drop exercise. Drag Chemical Ions to their names Nitrate Acetate Hydrogen carbonate Carbonate Sulfate Ammonium Hydroxide Cyanide Hypochlorite Permanganate Chromate Dichromate Sulfite Nitrite Hydronium NO3- CH3COO- HCO3- CO32- SO42- NH4+ OH- CN- ClO- MnO4- CrO42- Cr2O72- SO32- NO2- H3O+