9 Polyatomic Ions

• Sulfate


  SO4 2-
• Phosphate


  PO4 3-
• Peroxide


  O2 2-
• Nitrate


  NO3 -
• Hydroxide


  OH -
• Hydrogen Carbonate


  HCO3 -
• Cyanide


  CN -
• Carbonate


  CO3 2-
• Ammonium


  NH4 +