Which of the following set of quantum numbers is not possible for an electron in the ground state of an atom with atomic number `19`?

Options

A. `n = 3,l = 1, m_(l) =-1`
B. `n=2, l = 1, m_(l) = 0`
C. `n = 3, l = 2, m_(l) =- 2`
D. `n = 2,l = 0, m_(l) = 0`

Answer

C

Explanation

The ground state electron configuration of an atom with atomic number `19` is as follows:
`1s^(2)2s^(2)2p^(6)3s^(6)4s^(1)`
For the `s` subshell, `l = 0`and for the `p` subshell, `l = 1`.
Thus, the third set of quantum members is not allowed as it implies electron in a `d` subshell `(l = 2)`.