Common Polyatomic Ions & Type II Cations

NH4 +1

NH4 +1

Ammonium

NO2 -1

Nitirite

NO3 -1

Nitrate

SO3 -2

Sulfite

SO4 -2

Sulfate

HSO4 -1

Hydrogen Sulfate (bisulfate)

OH -1

Hydroxide

CN -1

Cyanide

PO4 -3

Phosphate

HPO4 -2

Hydrogen Phosphate

H2PO4 -1

Dihydrogen Phosphate

NCS -1

Thiocyanate

CO3 -2

Carbonate

HCO3 -1

Hydrogen Carbonate (bicarbonate)

ClO -1

Hypochlorite

ClO2 -1

Chlorite

ClO3 -1

Chlorate

ClO4 -1

Perchlorate

C2H3O2 -1 (CH3COO -1)

Acetate

MnO4 -1

Permanganate

Cr2O7 -2

Dichromate

CrO4 -2

Chromate

C2O4 -2

Oxalate

IO3 -1

Iodate

SiO3 -2

Silicate

S2O3 -2

Thisulfate

Iron Ions

Fe +3 & +2

Copper Ions

Cu +2 & +1

Cobalt Ions

Co +3 & +2

Tin Ions

Sn +4 & +2

Lead Ions

Pb +4 & +2

Mercury Ions

Hg +2 & +1

Zinc

Zn +2

Silver

Ag +1