Common Ion Chart
Positive Ions (Cations)
Negative Ions (Anions)
Al +3
Aluminum
Acetate
C2H3O2 – / CH3COO –
Ammonium
Barium
Cadmium
Calcium
Chromium (II)
Chromium (III)
Cobalt (II)
Copper (I)
NH4 +
Ba +2
Cd +2
Ca +2
Cr +2
Cr +3
Co +2
Cu +
Bromide
Br –
Carbonate
CO3 –2
Hydrogen Carbonate Ion / Bicarbonate HCO3–
Chlorate
ClO3 –
Chloride
Cl –
Chlorite
ClO2 –
Chromate
CrO42–
Cyanide
CN –
Copper (II)
Hydrogen
Hydronium
Iron (II)
Iron (III)
Lead (II)
Lead (IV)
Lithium
Cu +2
H+
H3O +
Fe +2
Fe +3
Pb +2
Pb+4
Li +
Dichromate
Fluoride
Hydride
Hydroxide
Hypochlorite
Iodate
Iodide
Nitrate
Cr2O7 –2
F–
H–
OH –
ClO –
IO3–
I–
NO3 –
Magnesium
Manganese (II)
Mercury (I)
Mercury (II)
Potassium
Silver
Strontium
Sodium
Tin (II)
Tin (IV)
Zinc
Mg +2
Mn +2
Hg2 +2
Hg +2
K+
Ag +
Sr +2
Na +
Sn +2
Sn +4
Zn +2
Nitride
Nitrite
Oxalate
Oxide
Hydrogen Oxalate Ion
Perchlorate
Permanganate
Peroxide Ion
Phosphate
Monohydrogen Phosphate
Dihydrogen Phosphate
Silicate
Sulfate
Hydrogen Sulfate Ion / Bisulfate
Thiosulfate
Sulfide
Hydrogen Sulfide Ion / Bisulfide
Sulfite
N –3
NO2 –
C2O4 –2
O –2
HC2O4 –
ClO4 –
MnO4 –
O2 –2
PO4 –3
HPO4 –2
H2PO4 –
SiO3–2
SO4 –2
HSO4 –
S2O3 –2
S –2
HS –
SO3 –2
1 – mono
2 – di
3 – tri
4 – tetra
5 – penta
6 – hexa
7 – hepta
8 - octa
9 – nona
10 – deca
Hydrogen Sulfite Ion / Bisulfite
HSO3–