Question

Cr 24 and Cu 29 special case and reason in a paragraph

Answer 1

The reason for the presence of exceptional cases as Cr and Cu are:

• These configurations are exceptionally Symmetrical in nature, And as symmetry leads to stability. So, the electrons in the atoms of these elements change their positions accordingly.

• Exchange Energy: The electrons in the subshells with parallel spins exchange their positions and release Energy called as Exchange energy. The electrons in atoms try to gain most number of possible exchanges given by ∑(n−1).

Therefore, Elements like Chromium, Copper, Niobium, Molybdenum, Ruthenium, Rhodium, Palladium, Silver, Lanthanum, Cerium, Gadolinium, and Gold have exceptional configurations.