The first letter of the symbol for the ion is always printed and in upper case. If there is a second letter it is always written using script and lower case. The symbols to the left are all printed because of the medium used to present this page.

N.B. a lower case script N has two humps; a lower case script M has three humps.

A plus one or negative one charge can be shown with a superscript of the charge only such as with bromide to the left and the ion sodium.

For an ion that has a charge greater than one, either positive or negative, the number indicating the size of the charge and the sign indicating positive or negative is written as a superscript.

 

Modified August 2007

aluminum

Al 3+

acetate

CH3COO -
or
C2H3O2 -

ammonium

NH4 +

bromide

Br -

arsenic (III)

As 3+

carbonate

CO3 2-

barium

Ba 2+

chlorate

ClO3 -

calcium

Ca 2+

chloride

Cl -

chromium (II)

Cr 2+

chlorite

ClO2 -

chromium (III)

Cr 3+

chromate

CrO4 2-

cobalt (II)

Co 2+

cyanide

CN -

cobalt (III)

Co 3+

dichromate

Cr2O7 2-

copper (I)

Cu +

fluoride

F -

copper (II)

Cu 2+

hydride

H -

hydronium

H3O +

hydrogen carbonate

HCO3 -

iron (II)

Fe 2+

hydrogen sulfate

HSO4 -

iron (III)

Fe 3+

hydroxide

OH -

lead (II)

Pb 2+

hypochlorite

ClO -

lead (IV)

Pb+4

iodide

I -

magnesium Mg 2+

nitrate

NO3 -

manganese (II) Mn+2 nitride N3-

manganese (III)

 Mn+3

nitrite

NO2 -

mercury (I) Hg +or Hg2 2+ oxalate C2O42-
mercury (II)

Hg 2+

oxide

O 2-
nickel (II) Ni 2+

perchlorate

ClO4 -
potassium K +

permanganate

MnO4 -
silver Ag +

peroxide

O2 2-
sodium Na +

phosphate

PO4 3-
strontium Sr 2+ phosphide P3-
tin (II)

Sn 2+

silicate SiO32-

tin (IV)

Sn 4+

sulfate

SO4 2-

titanium (III) Ti 3+

sulfide

S 2-

titanium (IV) Ti 4+

sulfite

SO3 2-

zinc Zn 2+ thiocyanate SCN1-
    thiosulfate S2O32-