Arrange the energy of the $2s$ orbital for hydrogen,lithium,sodium,and potassium in increasing order.

The four quantum numbers of the valence electron of potassium are

$\Psi_{310}$ has

The order of increasing energies of the orbitals follows:

Select the correct statements for quantum numbers.
$(i)$ Magnetic quantum number $(m_l)$ gives information about the spatial orientation of orbitals with respect to the standard set of coordinate axes.
$(ii)$ Electron spin quantum number is represented by '$s$' and has values of $\pm \frac{1}{2}$.
$(iii)$ Principal quantum number $(n)$ determines the size of the orbitals and also,to a large extent,the energy of the orbitals.

The maximum number of electrons present in an orbit with azimuthal quantum number $l = 3$ is: