AP Chemistry Common Ions / Polyatomic Ions

Cations, Anions, and Polyatomic Ions

Acetate

C₂H₃O₂^-

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)

Cu⁺

Copper (II)

Cu²⁺

Hydrogen

H⁺

Hydronium

H₃O⁺

Iron (II)

Fe²⁺

Iron (III)

Fe³⁺

Lead (II)

Pb²⁺

Lead (IV)

Pb⁴⁺

Lithium

Li⁺

Magnesium

Mg²⁺

Manganese (II)

Mn²⁺

Manganese (IV)

Mn⁴⁺

Mercury (I)

Hg₂²⁺

Mercury (II)

Hg²⁺

Nickel (II)

Ni²⁺

Potassium

K⁺

Silver

Ag⁺

Sodium

Na⁺

Strontium

Sr²⁺

Tin (II)

Sn²⁺

Tin (IV)

Sn⁴⁺

Zinc

Zn²⁺

Bromide 

Br^-

Hypobromite

BrO^-

Bromite

BrO₂^-

Bromate

BrO₃^-

Perbromate

BrO₄^-

Calcium

Ca²⁺

Carbonate

CO₃^2-

Hypochlorite

ClO^-

Chlorite

ClO₂^-

Chlorate

ClO₃^-

Perchlorate

ClO₄^-

Chloride

Cl^-

Chromate

CrO₄^2-

Chromium (II)

Cr²⁺

Chromium (III)

Cr³⁺

Cobalt (II)

Co²⁺

Cobalt (III)

Co³⁺

Copper (I)

Cu⁺

Copper (II)

Cu²⁺

Cyanide

CN^-

Dichromate 

Cr₂O₇^2-

Dihydrogen Phosphate

H₂PO₄^-

Acetate

C₂H₃O₂^-

Fluoride

F^-

Gallium

Ga³⁺

Gold (I)

Au⁺

Gold (III)

Au³⁺

Hydride

H^-

Bicarbonate

HCO₃^-

Hydrogen Oxalate / Binoxalate

HC₂O₄^-

Hydrogen Phosphate

HPO₄^2-

Hydrogen Sulfate / Bisulfate

HSO₄^-

Hydrogen Sulfide / Bisulfide

HS^-

Hydrogen Sulfite / Bisulfite

HSO₃^-

Hydroxide

OH^-

Indium

In³⁺

Hypoiodite

IO^-

Iodite

IO₂^-

Iodate

IO₃^-

Periodate

IO₄^-

Iodide

I^-

Iron (II)

Fe²⁺

Iron (III)

Fe³⁺

Lead (II)

Pb²⁺

Lead (IV)

Pb⁴⁺

Magnesium

Mg²⁺

Manganese (II)

Mn²⁺

Manganese (III)

Mn³⁺

Permanganate

MnO₄^-

Mercury (I)

Hg₂²⁺

Mercury (II)

Hg²⁺

Nickel (II)

Ni²⁺

Nickel (III)

Ni³⁺

Nitrate

NO₃^-

Nitride

N^3-

Nitrite

NO₂^-

Oxalate

C₂O₄^2-

Oxide

O^2-

Peroxide

O₂^2-

Phosphate

PO₄^3-

Phosphide

P^3-

Phosphite

PO₃^3-

Rubidium

Rb⁺

Scandium

Sc³⁺