AP Chemistry Common Ions

Cations, Anions, and Polyatomic Ions

Aluminum

Al³⁺

Ammonium

NH₄⁺

Arsenic (III)

As³⁺

Arsenic (V)

As⁵⁺

Barium

Ba²⁺

Bismuth (III)

Bi³⁺

Bismuth (V)

Bi⁵⁺

Cadmium

Cd²⁺

Calcium

Ca²⁺

Chromium (II)

Cr²⁺

Chromium (III)

Cr³⁺

Cobalt (II)

Co²⁺

Cobalt (III)

Co³⁺

Copper (I) / Cuprous

Cu⁺

Copper (II) / Cupric

Cu²⁺

Hydrogen

H⁺

Hydronium

H₃O⁺

Iron (II) / Ferrous

Fe²⁺

Iron (III) / Ferric

Fe³⁺

Lead (II) / Plumbous

Pb²⁺

Lead (IV) / Plumbic

Pb⁴⁺

Lithium

Li⁺

Magnesium

Mg²⁺

Manganese (II)

Mn²⁺

Manganese (IV)

Mn⁴⁺

Mercury (I) / Mercurous

Hg₂²⁺

Mercury (II) / Mercuric

Hg²⁺

Nickel (II)

Ni²⁺

Potassium

K⁺

Silver

Ag⁺

Sodium

Na⁺

Strontium

Sr²⁺

Tin (II) / Stannous

Sn²⁺

Tin (IV) / Stannic

Sn⁴⁺

Zinc

Zn²⁺

Bromide 

Br^-

Bromate (I) / Hypobromite

BrO^-

Bromate (III) / Bromite

BrO₂^-

Bromate (V) / Bromate

BrO₃^-

Bromate (VII) / Perbromate

BrO₄^-

Carbonate

CO₃^2-

Chlorate (I) / Hypochlorite

CIO^-

Chlorate (III) / Chlorite

ClO₂^-

Chlorate (V) / Chlorate

ClO₃^-

Chlorate (VII) / Perchlorate

CIO₄^-

Chloride

Cl^-

Chromate

CrO₄^2-

Cyanide

CN^-

Dichromate 

Cr₂O₇^2-

Dihydrogen Phosphate

H₂PO₄^-

Ethanoate / Acetate

C₂H₃O₂^-

Fluoride

F^-

Hydride

H^-

Hydrogen Carbonate / Bicarbonate

HCO₃^-

Hydrogen Oxalate / Binoxalate

HC₂O₄^-

Hydrogen Phosphate

HPO₄^2-

Hydrogen Sulfate / Bisulfate

HSO₄^-

Hydrogen Sulfide / Bisulfide

HS^-

Hydrogen Sulfite / Bisulfite

HSO₃^-

Hydroxide

OH^-

Iodate (I) / Hypoiodite

IO^-

Iodate (III) / Iodite

IO₂^-

Iodate (V) / Iodate

IO₃^-

Iodate (VII) / Periodate

IO₄^-

Iodide

I^-

Manganate (VII) / Permanganate

MnO₄^-

Nitrate

NO₃^-

Nitride

N^3-

Nitrite

NO₂^-

Oxalate / Ethandioate

C₂O₄^2-

Oxide

O^2-

Peroxide

O₂^2-

Phosphate

PO₄^3-

Phosphide

P^3-

Phosphite

PO₃^3-

Sulfate 

SO₄^2-

Sulfide

S^2-

Sulfite

SO₃^2-

Thiosulfate

S₂O₃^2-

Thiocyanate

SCN^-