The magnetic quantum number specifies

For $n = 5$ and $m = 2$,which of the following statements is incorrect?

The number of electrons that can be present in sub-shells having $m_s$ value of $\frac{-1}{2}$,for $n$ up to $3$.

The maximum number of electrons present in an orbital with $n=4, l=3$ is

The quantum number which explains the line spectra observed as doublets in the case of hydrogen and alkali metals, and doublets and triplets in the case of alkaline earth metals is:

The number of possible spatial orientations of an electron in an atom is given by its