Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

The atomic number of neodymium is $60$.

Therefore, the electronic configuration of neodymium (Nd) can be determined by distributing its electrons according to the Aufbau principle, Pauli exclusion principle, and Hund's rule.

Electronic configuration of $\mathrm{Nd}(\mathrm{Z} = 60)$ is;

$\left[\mathrm{Xe}\right] 4{\mathrm{f}}^{4}6{\mathrm{s}}^2$

as the last electron of Neodymium enters the f subshell. so it is called a f-block element.

Hence option A is the answer.