Polyatomic ions

List of common Polyatomic ions found in the Ap Chemistry Exam

NH4 +

Ammonium

CN -

Cyanide

OH -

Hydroxide

C2H3O2 -

Acetate

ClO -

Hypochlorite

ClO2 -

Chlorite

NO2 -

Nitrite

HSO4 -

Bisulfate

ClO3 -

Chlorate

ClO4 -

Perchlorate

CrO4 -2

Chromate

CO3 -2

Carbonate

SO3 -2

Sulfite

SO4 -2

Sulfate

Cr2O7 -2

Dichromate

C2O4 -2

Oxalate

PO4 -3

Phosphate

NO3 -

Nitrate

HCO3 -

Bicarbonate

Cu +

Copper (I) or cuprous

H +

Hydrogen “proton”

H3O +

Hydronium Ion

Ag +

Silver

Li + , Na + , K + , Rb +, Cs + , Fr +

Group 1 metals

Cd +2

Cadmium

Cr +2

Chromium (II)

Cu +2

Copper (II) or cupric

Co +2

Cobalt (II)

Pb +2

Lead (II)

Mn +2

Manganese

Hg +2

Mercury (II)

Ni +2

Nickel

Sn +2

Tin (II)

Zn +2

Zinc

Be +2 , Mg +2 , Ca +2 , Sr +2 , Ba +2 , Ra +2

Group 2

Al +3

Aluminum

Cr +3

Chromium (III)

Fe +3

Iron (III)

Pb +4

Lead (IV)

Sn +4

Tin (IV)

H3PO4 -

Dihydrogen Phosphate

HSO4 -

Bisulfate

MnO4 -

Permanganate

SCN -

Thiocyanate

F - , Cl - , Br - , I -

Group 17

HPO4 -2

Hydrogen phosphate

O -2

Oxide

O2 -2

Peroxide

S -2

Sulfide

S2O3 -2

Thiosulfate

PO3 -3

Phosphite

AsO4 -3

Arsenate

N -3 , P -3

Group 15 (Nitride and Phosphide)