Which of the following sets of quantum numbers is not allowed.

Options

A. `n = 3, l = 1, m = + 2`
B. `n = 3, l = 1, m = + 1`
C. `n = 3, l = 0 , m = 0`
D. `n = 3, l = 2, m = +- 2`

Answer

A

Explanation

(a) If `n = 3`
`1 = 0, 1,2`
for `1 = 0, m = 0`
`1 = 1, m = -1, 0, + 1`
`1 = 2m = -2, - 1, 0, + 1, + 2`
If `1 = 1`, the vlaue of `m` cannot be `2`.