Polyatomic Ions and Metals with Variable Charge

Ammonium

Ammonium

NH₄⁺

acetate

C₂H₃O₂⁻

bicarbonate (hydrogen carbonate)

HCO₃⁻

bisulfate (hydrogen sulfate)

HSO₄⁻

Bromate

BrO₃⁻

Perchlorate

ClO₄⁻

Chlorate

ClO₃⁻

Chlorite

ClO₂⁻

Hypochlorite

ClO⁻

Cyanide

CN⁻

Thiocyanate

SCN⁻

Hydroxide

OH⁻

Periodate

IO₄⁻

Iodate

IO₃⁻

Nitrate

NO₃⁻

Nitrite

NO₂⁻

Permanganate

MnO₄⁻

biphosphate (hydrogen phosphate)

HPO₄⁻²

Carbonate

CO₃⁻²

Chromate

CrO₄⁻²

Dichromate

Cr₂O₇⁻²

Oxalate

C₂O₄⁻²

Peroxide

O₂⁻²

Sulfate

SO₄⁻²

Sulfite

SO₃⁻²

Thiosulfate

S₂O₃⁻²

Phosphate

PO₄⁻³

Phosphite

PO₃⁻³

Silicate

SiO₃⁻²

Chromium 2&3

Cr Cr

Cobalt 2&3

Co Co

Copper 1&2

Cu Cu

Iron 2&3

Fe Fe

Lead 2&4

Pb Pb

Manganese 2&3

Mn Mn

Mercury 1&2

Hg Hg

Nickel 2&3

Ni Ni

Tin 2&4

Sn Sn

Gold 1&3

Au Au