Question

Explain the anamalous behavior of copper and chromium

Answer 1

Explanation:

Copper and chromium have anomalous behaviour as they do not follow the Aufbau principle and rearrange their electrons in a different way so as to achieve greater stability.

It explains that electrons occupy orbitals starting from the lower energy to that of the higher ones. However, copper and chromium behave differently.

According to the principle, the arrangements should have been:

Cr: [Ar] 4s2 3d4

Cu: [ Ar] 4s2 3d9

But in reality, to achieve partially filled and completely filled stable orbitals they rearrange as-

Cr: [Ar] 4s1 3d5

Cu: [ Ar] 4s1 3d10.

(Also it is anomalous)