Question

Which of the following represents the electronic configuration of d-block elements?

• A. $(n-1)s^{2}n{d}^{1-10}$
• B. $(n-1)d^{1-10}n{s}^{1-2}$
• C. $(n-1)s^2{p}^{6}n{s}^1$
• D. $n{s}^2{p}^2{d}^1$

Answer 1

The correct option is B $(n-1)d^{1-10}n{s}^{1-2}$

Generally, the electronic configuration of these elements is $(n-1)d^{1-10}n{s}^{1-2}$. The $(n–1)$ remains for the inward d orbitals which may have one to ten electrons and the peripheral ns orbital may have one or two electrons.

The very name "transition" given to the elements of d-block is simply because of their position amongst s– and p– block elements.

The d–orbitals of the penultimate energy level in their atoms get electrons leading to the three columns of the transition metals, i.e., 3d, 4d and 5d. The fourth line of 6d is still inadequate.

Hence, option B is correct.