Symbols and Charges for Monatomic Ions

Fixed Charge

Symbol

Name

Symbol

Name

H1+

hydrogen ion

H1-

hydride

Li1+

lithium ion

F1-

fluoride

Na1+

sodium ion

Cl1-

chloride

K1+

potassium ion

Br1-

bromide

Rb1+

rubidium ion

I1-

iodide

Cs1+

cesium ion

O2-

oxide

Be2+

beryllium ion

S2-

sulfide

Mg2+

magnesium ion

Se2-

selenide

Ca2+

calcium ion

Te2-

telluride

Sr2+

strontium ion

N3-

nitride

Ba2+

barium ion

P3-

phosphide

Ra2+

radium ion

As3-

arsenide

Al3+

aluminum ion

The ending for a negative ion’s name is –ide. 

For example, fluorine is fluoride. Replace the  -ine with -ide

Ag1+

silver ion

Zn2+

zinc ion

Symbols and Charges for Monoatomic Ions

Variable Charge

Symbol

(Stock system) 

Systematic name

Common name

Symbol

(Stock system) 

Systematic name

Common name

Cu+

copper(I)

cuprous

Ni2+

Nickel(II)

nickelous

Cu2+

copper(II)

cupric

Ni4+

Nickel(IV)

nickelic

Au+

gold(I)

aurous

Sn2+

tin(II)

stannous

Au3+

gold(III)

auric

Sn4+

tin(IV)

stannic

Cr2+

chromium(II)

chromous

Pb2+

lead(II)

plumbous

Cr3+

chromium(III)

chromic

Pb4+

lead(IV)

plumbic

Mn2+

manganese(II)

manganous

Mn3+

manganese(III)

manganic

Fe2+

iron(II)

ferrous

Hg22+

mercury(I)

mercurous

Fe3+

iron(III)

ferric

Hg2+

mercury(II)

mercuric

Co2+

cobalt(II)

cobaltous

Co3+

cobalt(III)

cobaltic

Symbols and Charges for Polyatomic Ions

Formula

Name

Formula

Name

ClO31-

chlorate

NO31-

nitrate

ClO21-

chlorite

NO21-

nitrite

ClO1-

hypochlorite

IO41-

periodate

ClO41-

perchlorate

IO31-

iodate

PO43-

phosphate

IO1- 

hypoiodite

PO33-

phosphite

CO32-

carbonate

HPO42-

hydrogen phosphate

HCO31-

hydrogen carbonate or bicarbonate

H2PO41-

dihydrogen phosphate

BrO31-

bromate

SO32-

sulfite

BrO-

hypobromite

SO42-

sulfate

HC2O41-

hydrogen oxalate or binoxalate

HSO41-

hydrogen sulfate or bisulfate

CN1-

cyanide

HSO31-

hydrogen sulfite or bisulfite

HS1-

hydrogen sulfide

CrO42-

chromate

S2O32-

thiosulfate

Cr2O72-

dichromate

AsO43-

arsenate

MnO41-

permanganate

O22-

peroxide

OH1-

hydroxide

NH21-

amide

BO33-

borate

B4O72-

tetraborate

NH4+

ammonium

The polyatomic ions below do not have to be memorized, but you will encounter them.

C2O42-

oxalate

C4H4O62-

tartrate

SCN1-

thiocyanate

SeO42-

selenate

C2H3O21- (CH3COO1-) 

acetate

SiO32-

silicate

SiF62-        

hexafluorosilicate

Greek prefixes used for naming Non-metal bonded to Non-metal

mono-1

di-2

tri-3

tetra-4

penta-5

hexa-6

hepta-7

octa-8

nona-9

deca-10