An $e^-$ has a magnetic quantum number $(m_l)$ of $-3$. What is the minimum possible principal quantum number $(n)$ for this electron?

Which of the following orbitals does not have any directional properties?

The atomic number of an element is $17$. The number of orbitals containing electron pairs in its valence shell is

Provide the four quantum numbers for the two outermost electrons of $Ca$ $(Z = 20)$.

The general configuration of the outermost and penultimate shell is $(n - 1)s^2 (n - 1)p^6 (n - 1)d^x ns^2$. If $n = 4$ and $x = 5$,then the number of protons in the nucleus will be:

Number of unpaired electrons in the ground state of beryllium atom is