The radial part of the wave function is determined by which quantum numbers?

The atomic weight of an element is double its atomic number. If there are four electrons in the $2p$ orbital,the element is:

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?

Which of the following statement$(s)$ is/are true?
$A$. If two orbitals have the same value of $(n+l)$, the orbital with lower value of $n$ will have lower energy.
$B$. Energies of the orbitals in the same subshell increase with increase in atomic number.
$C$. The size of $2p_x$ orbital is less than the size of $3p_x$ orbital.
$D$. Among $5f, 6s, 4d, 5p$ and $5d$ orbitals, none of the orbitals have $2$ radial nodes.

Which of the following statements is not correct for an electron that has the quantum numbers $n = 4$ and $m = 2$?

The orientation of an atomic orbital is governed by