The number of nodal planes (planes of zero electron density) in the $d_{xy}$ orbital is:

Write about the magnetic quantum number $(m_{l})$.

Maximum number of electrons that can be accommodated in the subshell with azimuthal quantum number $l=4$ is

Which set of quantum numbers is not possible from the following?

The number of radial nodes of $3s$ and $2p$ orbitals are respectively.

Identify the correct statements among the following:
$i. E_{2s}(H) > E_{2s}(Li) < E_{2s}(Na) > E_{2s}(K)$
$ii.$ The maximum number of electrons in the shell with principal quantum number $n$ is equal to $2n^2$.
$iii.$ Extra stability of half-filled subshell is due to smaller exchange energy.
$iv.$ Only two electrons,irrespective of their spin,may exist in the same orbital.