polyatomic ions

acetate

C2H3O2

ferric

Fe 3+ (yellow)

oxalate

C2O4 2-

aluminum

Al3+

ferrous

Fe 2+ (green)

oxide

O 2-

ammonium

NH4 +

fluoride

F-

perbromate

BrO4 -

barium

Ba2+

hydrogen

H+

perchlorate

ClO4 -

bicarbonate

HCO3 -

hydronium

H3O+

periodate

IO4 -

bisulfate

HSO4 -

hydroxide

OH-

permanganate

MnO4 - (purple)

bisulfide

HS-

hypobromite

BrO-

peroxide

O2 2-

bisulfite

HSO3 -

hypochlorite

ClO-

phosphate

PO4 3-

bromate

BrO3 -

hypoiodite

IO-

phosphide

P 3-

bromide

Br-

iodate

IO3 -

phosphite

PO3 3-

bromite

BrO2 -

iodide

I-

potassium

K+

calcium

Ca2+

iodite

IO2 -

silver

Ag+

carbonate

CO3 2-

lead

Pb 2+

sodium

Na+

chlorate

ClO3 -

lithium

Li+

stannic

Sn 4+

chloride

Cl-

magnesium

Mg 2+

stannous

Sn 2+

chlorite

ClO2 -

manganese

Mn 2+

strontium

Sr 2+

chromate

CrO4 2- (yellow)

mercuric

Hg 2+

sulfate

SO4 2-

chromium

Cr3+

mercurous

Hg2 2+

sulfide

S 2-

cupric

Cu2+ (blue)

nickel

Ni 2+ (green)

sulfite

SO3 2-

cuprous

Cu+ (green)

nitrate

NO3 -

thiocyanate

SCN-

cyanide

CN-

nitride

N 3-

thiosulfate

S2O3 2-

dichromate

Cr2O7 2- (orange)

nitrite

NO2 -

zinc

Zn 2+