Question

If Z = 10 the valency of the element is……

Answer 1

the no. of electrons is 10
k shell = 2
L shell =8
total 10
there is no valence electron
i.e, the valency is 0

Answer 2

Hey friend, Harish here.

Here is your answer.

Given that :

Z = 10

This tells that the element is a Neon gas. Ne is a noble gas. Hence it's valency is zero because it has completely filled valence shell.

Electronic configuration of Ne : 2 , 8

Hence it has no necessity to gain or loss electron.

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Hope my answer is helpful to you.