Question

Identify the correct statements among the following:
(A) All orbitals in a shell are degenerate.
(B) Electron configuration of chromium violates Aufbau principle.
(C) Maximum number of unpaired electrons in 'f' subshell is 7.
(D) Maximum number of unpaired electrons in a subshell is 4$l$ + 1.

• A. A, B, C
• B. A, C, D
• C. B, C
• D. B, D

Answer 1

Answer: (C)

B, C

All orbitals having electrons of same energy is called degenerated orbitals. All orbitals of the same shell may or may not have the same energy.

In chromium, electrons rearranged himself to make half filled configuration violating Aufbau principle.

The maximum number of orbitals in f subshell is 7, So maximum electrons that can be unpaired is 7.

The maximum number of unpaired electrons in a subshell id 2l+1.

Thus, option B and c are correct.