Question

If k and I shells of an atom are completely filled what would be the 1.total number of electrons in the atom and it's valency

Answer 1

given that the K,L shells of an atom are completely filled => total number of electrons in the atom = 10 [since Principle quantum number value of K shell (n) =1=>number of electrons in K shell = 2(n^2)=2(1)=2 similarly for L shell n=2 => number of electrons in L shell = 2(2)^2= 2(4)=8
hence total number of electrons in the atom is 10 and it's valency is 0 since the outer most shell of the atom is completely filled

Answer 2

1.)K shell has 2 electrons and
L shell has 8 electrons.
∴ Total no: of electrons = 2 + 8 = 10 electrons.
⇒The element is Neon

2.) Electronic configuration = 2, 8
Valency = 0
This is because its K shell and L shell are fully filled and it does not need to gain or lose or share electrons.Hence its valency is 0.