Polyatomic Ions

AP Chem

What does the suffix “Hyper” or “Per” mean?

This compound has the most number of oxygen atoms.

What does the suffix “-ate” mean?

This compound has more oxygen atoms.

What does the suffix “-ite” mean?

This compound has less oxygen atoms.

What does the suffix “Hypo” mean?

This compound has the least amount of oxygen atoms.

NH4 +

Ammonium

Permanganate

MnO4 -

Acetate

C2H3O2 -

Nitrate

NO3 -

Nitrite

NO2 -

Cyanide

CN -

Thiocyanate

SCN -

Hydroxide

OH -

Bicarbonate

HCO3 -

Dichromate

Cr2O7 2-

Chromate

CrO4 2-

Phosphate

PO4 3-

Phosphite

PO3 3-

Bisulfate

HSO4 -

Sulfate

SO4 -2

Sulfite

SO3 2-

Bisulfite

HSO3 -

Carbonate

CO3 2-

Perchlorate

ClO4 -

Chlorate

ClO3 -

Chlorite

ClO2 -

Hypochlorite

ClO -

Periodate

IO4 -

Iodate

IO3 -

Iodite

IO2 -

Hypoiodite

IO -

Perbromate

BrO4 -

Bromate

BrO3 -

Bromite

BrO2 -

Hypobromite

BrO -

Arsenate

AsO4 3-

Formate

HCOO -

Thiosulfate

S2O3 2-

Borate

BO3 3-

Meta-Silicate

SiO3 2-

Oxalate

C2O4 2-

Hydrogen Phosphate

HPO4 2-

Dihydrogen Phosphate

H2PO4 -