The magnetic quantum number for the valence electron of sodium is

In the ground state,an element has $13$ electrons in the $M$ shell. The element is

For a magnetic quantum number $m = 0, \pm 1$,the value of the principal orbital (azimuthal quantum number $l$) corresponds to which subshell,and what is the minimum principal quantum number $n$ required for this set?

List the quantum numbers ($l$ and $m_{l}$) for an electron in a $3d$ orbital.

Chromium has the electronic configuration $4s^1 3d^5$ rather than $4s^2 3d^4$ because

What is the number of orbitals in any subshell? Explain.