The set of orbitals filled just after the filling of electrons in an atom with atomic number $Z = 56$ is:

$A$: The energy of an electron can be determined by the principal quantum number.
$R$: The principal quantum number $(n)$ determines the possible distance of the electron from the nucleus.

What is the number of radial and angular nodes in a $5f$ orbital?

The azimuthal quantum number for the valence electrons of $Ga^{+}$ ion is $.....$
(Atomic number of $Ga = 31$)

Which of the following sets represents degenerate orbitals?

The sum of paired electrons present in $l = 2$ orbitals for the species $Fe^{2+}$,$Co^{2+}$,and $Ni^{2+}$ is .......