Polyatomic Ions and Special Cases for Binary Compounds

Carbonate

CO₃^2-

Nitrate

NO₃^1-

Phosphate

PO₄^3-

Sulfate

SO₄^2-

Chlorate

ClO₃^1-

Bromate

BrO₃^1-

Iodate

IO₃^1-

Prefix and suffix used for one more oxygen than -ate ion 

per___ate

Suffix used for most common number of oxygen atoms for a particular non-metal

-ate

Suffix used for one less oxygen than the -ate ion

-ite

Prefix and suffix used for two less oxygens than the -ate ion

Hypo___ite

Hydroxide

OH^-

Cyanide

CN^-

Ammonium

NH₄⁺