Question

In an atom, the total number of electrons having quantum numbers
`n = 4,|m_(l)| = 1` and `m_(s) =- (1)/(2)` is
A. 3
B. 4
C. 6
D. 8

Answer 1

Correct Answer - A
For n=4, `m_(1)=1`, there are three possible values of `m_(s)`.
These are -1,0+1.
For each orbital , there can be two electrons with spin `+1//2` and `-1//2`.
`:.` three electrons can have `m_(s)=-1//2`.