Question

what is valency ? and uses of valency​

Answer 1

HERE IS YOUR ANSWER :-

The combining capacity of an atom is called its valency.

For example lets take oxygen (electrons =8)

Electronic configuration is 2,6

But K=2 and L=8

Here in second orbit the electrons should be 8 but in oxygen these are only 6.

So to complete this shell oxygen will take 2 electrons from another atom and combine with it. Therefore, the combing capacity of oxygen is 2 .

Hence, its valency will be 2.

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Answer 2

the number of elctrons in valenced shell which undergoes chemical reactoin is known as Valency.

Valency is beneficial for us to determine the formula of a compound etc

hope it helps

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