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Valency Table

For common Ions:

Element Symbol Ion Ion Name

Aluminium Al Al3+ Ammonium NH4+

Barium Ba Ba2+ Carbonate CO32

Calcium Ca Ca2+ Hydrogen carbonate HCO3

Cobalt Co Co2+ Hydrogen sulphate HSO4

Copper Cu Cu+/Cu2+ Hydroxide OH

Hydrogen H H+(acids) Nitrate NO3

Iron Fe Fe2+/Fe3+ Nitrite NO2


Page 2

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Chlorine Cl Cl

Hydrogen H H+(hydride=H)

Iodide I I

Nitrogen N N3(nitride)

Oxygen O O2

Cations and Anions

Page 3

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Valency Table

For covalent compounds

(No of Bonds formed)

Hydrogen 1

Halogens (F, Cl, Br, I) 1

Oxygen 2

Sulphur 2, 4, 6

Nitrogen 3

Phosphorus 3, 5

Carbon 4

Silicon 4

Xenon 2, 4, 6, 8


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