Question

Explain why Cu and Cr are more stable as compared to other elements of 3d series?

Answer 1

Answer:

both examples, an electron moves from the 4s sublevel to produce a 1/2 full 3d (Cr) or completely filled 3d (Cu). This gives the atom greater stability so the change is favorable

Answer 2

Answer:

Exceptional electronic configuration arises because of the extra stability due to the half filled and fully filled electronic configuration. Half filled and fully filled electronic configuration have large exchange energy and consequently have greater stability.

Basically elements with either half filled OR fully filled electronic configuration have more stability. That's why Cr and Cu are more stable. If this helped, please mark as Brainliest.