Question

By using concept of exchange energy which is more stable.
3d6 3d5 3d4

Answer 1

Answer:

ANSWER

Second electronic configuration is more stable than the first one. This is because it is half filled and thus symmetrical.

When orbitals are half-filled or fully filled, then the electronic configuration becomes more stable.

Accordning half-filled electronic configuration.

 3d54s1 is more stable then 3d44s2.