TABLE of COMMON IONS

COMMON POSITIVE IONS (CATIONS)

aluminium

Al3+

lead(IV)

Pb4+

ammonium

NH4+

lithium

Li+

barium

Ba2+

magnesium

Mg2+

calcium

Ca2+

manganese (II)

Mn2+

caesium

Cs+

mercury (I)

Hg22+

chromium (II)

Cr2+

mercury (II)

Hg2+

chromium (III)

Cr3+

nickel(II)

Ni2+

copper (I)

Cu+

potassium

K+

copper (II)

Cu2+

silver

Ag+

hydrogen

H+

sodium

Na+

iron (II)

Fe2+

tin (II)

Sn2+

iron (III)

Fe3+

tin (IV)

Sn4+

lead (II)

Pb2+

zinc

Zn2+

     

 

COMMON NEGATIVE IONS (ANIONS)

acetate

CH3COO-

nitride

N3-

bromide

Br-

nitrite

NO2-

carbonate

CO32-

oxalate

C2O42-

hydrogen carbonate

HCO3-

oxide

O2-

chlorate

ClO3-

permanganate

MnO4-

perchlorate

ClO4-

phosphide

P3-

chloride

Cl-

phosphate

PO43-

chlorite

ClO2-

(mono)hydrogen phosphate

HPO42-

hypochlorite

ClO-

dihydrogen phosphate

H2PO4-

chromate

CrO42-

sulphate

SO42-

dichromate

Cr2O72-

hydrogen sulphate

HSO4-

cyanide

CN-

sulphide

S2-

fluoride

F-

hydrogen sulphide

HS-

hydride

H-

sulphite

SO32-

hydroxide

OH-

hydrogen sulphite

HSO3-

iodide

I-

thiocyanate

SCN-

nitrate

NO3-

thiosulphate

S2O32-

 

 

NOTE: chromium and manganese have positive elemental ions but negative polyatomic ions.

HISTORICAL NOTE: Anions with hydrogen in the name, eg hydrogen carbonate, used to be named with a bi- as in bicarbonate.