Question

atomic number of eliment b is 10 find its valency

Answer 1

It's valency is 0 as it is neon and is a noble gas.

Answer 2

HERE IS YOUR ANSWER

_____________________________

First,you need to write the electronic configuration of the element.

You get the configuration as
(2,8)
And the last shell is filled up already and its valency is zero.

_____________________________

THANK YOU