Question

Total no of electrons that can be present in
clockwise spin is Mth shell of an atom is 9​

Answer 1

So what are you asking exactly?

Answer 2

Shell number = 3 ( as it is M )

so n = 3
we know total number of electrons in a shell => 2n^2 ==> 2 x 9 ==> 18


now out of this 9 will have a spin of clockwise direction or +1/2


so answer ==> 9 //