What is the orbital angular momentum of an electron in a $2s$-orbital?

The orbital angular momentum of an electron in an orbital is given by $\sqrt{l(l + 1)} \cdot \frac{h}{2\pi}$. For an $s$-electron,this momentum is:

Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Energy of $2s$ orbital of hydrogen atom is greater than that of $2s$ orbital of lithium.
Reason $R$ : Energies of the orbitals in the same subshell decrease with increase in the atomic number.
In the light of the above statements,choose the correct answer from the options given below.

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

The $3p$ orbital has ........

Which of the following sets of quantum numbers represents the highest energy of an atom?