Polyatomic Ions

• NH4+: ammonium ion
• (CO3)2-: carbonate ion
• (HCO3)-: bicarbonate ion (hydrogen carbonate)
• ClO-: hypochlorite ion
• (ClO2)-: chlorite ion
• (ClO3)-: chlorate ion
• (ClO4)-: perchlorate ion
• (NO2)-: nitrite ion
• (NO3)-: nitrate ion
• (SO3)2-: sulfite ion
• (HSO3)-: bisulfite ion (hydrogen sulfite)
• (SO4)2-: sulfate ion
• (HSO4)-: bisulfate ion (hydrogen sulfate)
• (MnO4)-: permanganate
• (Cr2O7)2-: dichromate ion
• (CrO4)2-: chromate ion
• (S2O3)2-: thiosulfate ion
• (PO4)3-: phosphate ion
• (HPO4)2-: hydrogen phosphate ion
• (H2PO4)-: dihydrogen phosphate ion