The maximum number of electrons accommodated in $5f$ orbitals are

Which of the following is not a correct statement regarding the energies of orbitals?

The angular part of the wave function for an orbital is given by $\psi_{(\theta, \phi)} = \left( \frac{15}{4\pi} \right)^{1/2} \sin \theta \cos \theta \sin \phi$,where $\theta$ is the angle from the $z$-axis. The angular node$(s)$ are:

The maximum number of orbitals which can be identified with $n=4$ and $m_l=0$ is $\qquad$

The angular wave function $A(\theta, \phi)$ for a given atomic orbital is $\frac{1}{2}\sqrt{\frac{3}{\pi}}\cos \theta$ in the polar coordinate system. Identify the orbital.

For the electronic configuration $1s^2 2s^2 2p^3$,what is the number of electrons having $n = 2, l = 1$,and $s = +1/2$?