Question

Predict the valency of Ne Si S and Ca.

Explain with proper method

Answer 1

ne has no valecy because in its outmest orbit the number of elctron us 8 so it cannot share its electron because it is stable and also called enert gas
si has 4 valecy because in its outermost orbit no of electron is 4 so make a stable it can give or accept electron
in case of s and 20 first we find elctronic configuration then if the outermost orbit h no of electron is x then its valecy be 8-x

Answer 2

Here u go

The last column is valency