Question

The valency of aluminium is 3. Write the valency of their radicals present in the following compounds.

(a) Aluminium chloride

(b) Aluminium oxide

(c) Aluminium nitride

(d) Aluminium sulphate

Answer 1

The valency of an element indicates the number of electrons present in the outermost shell of an atom. It is the combining power of an element with another atom.

The valency of Aluminium is given i.e. 3

Let’s determine the valency of other radicals in the given compound,

(a). Aluminium Chloride

Chemical formula- $AlC{l}_3$

Other radical is chloride- $C{l}^{-}$
Valency of chloride= 1

(b) Aluminium Oxide

Chemical formula- $A{l}_2{O}_3$

Other radical is oxide- $O^{2-}$

Valency of oxide = 2

(c) Aluminium Nitride

Chemical formula- AlN

Other radical is nitride- $N^{3-}$

Valency of nitride = 3

(d) Aluminium Sulphate

Chemical formula- $A{l}_2(S{O}_4{)}_3$

Other radical is sulphate- $S{O}_4^2-$

Valency of sulphate = 2
Hence the valency of radicals are
(a) Aluminium chloride = 1

(b) Aluminium oxide = 2

(c) Aluminium nitride = 3

(d) Aluminium sulphate = 2