The two electrons occupying the same orbital are distinguished by:

Which of the following sets of quantum numbers is not possible for an electron?

When the value of the principal quantum number $n$ is $3$,what are the permitted values of the azimuthal quantum numbers $l$ and the corresponding magnetic quantum numbers $m$?

The electronic configurations of four elements are given in brackets:
$L(1s^2, 2s^2\ 2p^1);$ $M(1s^2, 2s^2\ 2p^5)$
$Q(1s^2, 2s^2\ 2p^6, 3s^1);$ $R(1s^2, 2s^2\ 2p^2)$
The element that would most readily form a diatomic molecule is:

According to the Aufbau principle,which orbital is filled with electrons immediately after the $5f$ orbital?

Which orbital is represented by the wave function $\Psi_{310}$?