Question

Element with the electronic configuration as $[Ar{]}^{18}3d^{5}4s^1$ is placed in

• A. IA, s-block
• B. VIA, s-block
• C. VIB, s-block
• D. VIB, d-block

Answer 1

The correct option is D

VIB, d-block

Let's look at the electronic configuration of the given element $[Ar{]}^{18}3d^{5}4s^1$.

As we studied in the last chapter we can see that instead of filling 4s fully, d orbital is half-filled.

Try to recall the concept of fully filled and half filled orbitals.

Do you remember that fully filled and half filled orbitals are more stable?

Fully filled and half filled orbitals are more stable because of symmetric distribution and exchange energy.

Now you can see that the same thing happening in this configuration.Therefore, we can say that this is a d-block element and because its atomic number is 24, it will be placed in VIB group.