An element has $d^5$ configuration. The total number of electron exchanges possible for it is

Which quantum number determines the shape of the subshell?

Explain the differences between the $1s$ and $2s$ orbitals based on their probability density plots and radial distribution.

The number of unpaired electrons in $1s^2 2s^2 2p^3$ is:

The electronic configuration of three elements $A$,$B$,and $C$ are given below. Stable form of $A$ may be represented by the formula:
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. $Z = 22$)