Number of electrons that Vanadium $(Z=23)$ has in p-orbitals is equal to $......$

The plot of $r^2 \Psi^2$ versus $r$ for $2s$ orbital of hydrogen atom exhibits :-

The maximum number of electrons that can be accommodated in all orbitals with quantum numbers $n = 3$ and $l = 2$ is $......$.

Which of the following is the correct set of $4$ quantum numbers for the $19^{th}$ electron in Chromium (Atomic number = $24$) in accordance with the Aufbau principle?

Given:
$(A)\ n = 5, m_l = +1$
$(B)\ n = 2, l = 1, m_l = -1, m_s = -1/2$
The maximum number of electron$(s)$ in an atom that can have the quantum numbers as given in $(A)$ and $(B)$ are respectively:

For an electron in a $4d$ orbital,which of the following sets of quantum numbers is not possible?