Question

What is called valency ? With an example. What is variable valency ?

Answer 1

valency is the no. of electrons present in the outermost shell of any atom

for example valency of oxygen is 2-

since it needs lacks 2 electrons in its outermost shell

as for being stable the atom must acquire octet valency which means 8 electrons in the outermost shell

how ever atoms which have only 1-2 electrons needs 2 electrons in its outermost shell and acquire duplet valency example - Helium

NOTE When gases have filled outermost shell they form inert or noble gases

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Answer 2

Explanation:

valency is the combining capacity of an element of a radical