The number of orbitals in the $d$ sub-shell is

What is the maximum number of electrons that can be accommodated in a shell with principal quantum number $n = 4$?

What would be the electronic configuration of $Cs (Z=55)$ in each case?
$(a)$ If there were three possibilities of the electron spin.
$(b)$ If the quantum number,$l$,could have the value $n$,and if all the rules governing electron configuration were otherwise valid.

The atomic orbitals are progressively filled in order of increasing energy. This principle is called as

How many maximum electrons can be accommodated in a $p$-orbital with $n = 6$ and $m = 0$?

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.