Q. Which of the following statements is incorrect?
A) Extra stability of half filled and completely filled orbitals among $s$ and $p$ block elements is reflected in trends of IE across a period
B) Extra stability of half-filled and completely filled orbitals among $s$ and $p$ block elements is reflected in EA trends across a period
C) Aufbau principle is incorrect for cases where energy difference between $ns$ and $(n - 1)d$ sub-shell us larger
D) Extra stability to half filled sub-shell is due to higher exchange energies
Explanation
The correct answer is Option C: Aufbau principle is incorrect for cases where energy difference between $ns$ and $(n - 1)d$ sub-shell us larger.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.