Common Polyatomics Chart

-1 charge

-2 charge

-3 charge

+1 charge

Dihydrogen phosphate (H₂PO₄^-)

Hydrogen phosphate (HPO₄^2-)

Phosphite (PO₃^3-)

Ammonium (NH₄⁺)

Acetate (C₂H₃O₂^-)

Oxalate (C₂O₄^2-)

Phosphate (PO₄^3-)

Hydrogen sulfite (HSO₃^-)

Sulfite (SO₃^3-)

Arsenate
(As₂O₃^3-)

Hydrogen sulfate (HSO₄^-)

Sulfate (SO₄^2-)

Hydrogen carbonate (HCO₃^-)

Carbonate (CO₃^2-)

Nitrite (NO₂^-)

Chromate (CrO₄^2-)

Nitrate (NO₃^-)

Dichromate (Cr₂O₇^2-)

Cyanide (CN^-₎

Silicate (SiO₃^2-)

Hydroxide (OH^-)

Peroxide (O₂^2-)

Permanganate (MnO₄^-)

Thiosulfate (S₂O₃^2-)

Hypochlorite (ClO^-)

Selenate (SeO₄^2-)

Chlorite (ClO₂^-)

Tartrate (C₄H₄O₆^2-)

Chlorate (ClO₃^-)

Perchlorate (ClO₄^-)

Amide (NH₂^-)

Periodate (IO₄^-)

Iodate (IO₃^-)

Bromate (BrO₃^-)

Thiocyanate (SCN^-)