For $p$-orbital,the magnetic quantum number has value

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.

Maximum number of electrons possible with spin quantum number $+\frac{1}{2}$ with principal quantum number $n=4$ in an atom is

What is the number of unpaired electrons in the electronic configuration of the $N^{+2}$ ion?

Which of the following sets of quantum numbers is impossible for an electron?

The number of unpaired electrons in $Ni$ (atomic number $= 28$) is: