Na⁺ has completely filled K and L shells. Explain.

[Extra information: The rules for the writing of the distribution of electrons in various shells for the first eighteen elements are given below:

(i) The maximum number of electrons present in a shell is given by the formula-2 n2

∵ n = orbit number i.e., 1, 2, 3

∵ The maximum number of electrons in different shells are:

K shell n = 1 2n2 => 2(1)2 = 2

L shell n = 2 2n2 => 2(2)2 = 8

M shell n = 3 2n2 => 2(3)2 = 18

N shell n = 4 2n2 => 2(4)2 = 32

(ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.

(iii) Electrons are not accommodated in a given shell unless the inner shells are filled.]