Question

If an electron has a magnetic quantum number of −1, it cannot be present in ____.

• A. d-orbital
• B. f-orbital
• C. p-orbital
• D. s-orbital

Answer 1

The correct option is D s-orbital

For s subshell the value of azimuthal quantum number $\left(l\right)$ = 0
The values of $m_l$ are $-ltol$ for any particular value of $\left(l\right)$.
Thus, for s subshell, where $l$ = 0, $m_l$ = 0 i.e. only possible value of $m_l$ is zero.
Therefore, an electron present in s orbital cannot have -1 magnetic quantum number.