Polyatomic Ions to Memorize

Hydroxide

OH⁻

Acetate

C₂H₃O₂⁻

Cyanide

CN⁻

Hydrogen carbonate (bicarbonate)

HCO₃⁻

Hypochlorite ⁻

ClO

Chlorite

ClO₂⁻

Chlorate ⁻

ClO₃

Perchlorate

ClO₄⁻

Hydrogen sulfate (bisulfate)

HSO₄⁻

Nitrate

NO₃⁻

Nitrite

NO₂⁻

Chromate

CrO₄²⁻

Dichromate⁻

Cr₂O₇²

Carbonate

CO₃²⁻

Sulfite ⁻

SO₃²

Sulfate ⁻

SO₄²

Phosphate⁻

PO₄³

Ammonium

NH₄⁺

Diatomic Hydrogen

H₂

Diatomic Nitrogen

N₂

Diatomic Oxygen

O₂

Diatomic Fluorine

F₂

Diatomic Chlorine

Cl₂

Diatomic Bromine

Br₂

Diatomic Iodine

I₂

Tetratomic Phosphorus

P₄

Octatomic Sulfur

S₈

Silver ion

Ag⁺

Zinc ion

Zn²⁺

Cadmium ion

Cd²⁺

Aluminum ion

Al³⁺

Gallium ion

Ga³⁺

Mercury (I)

Hg₂²⁺

Mercury (II)

Hg²⁺

Chromium charges

+2, +3

Manganese charges

+2, +3

Iron charges

+2, +3

Cobalt charges

+2, +3

Nickel charges

+2, +3

Copper charges

+1, +2

Gold charges

+1, +3

Lead charges

+2, +4

Tin charges

+2, +4