Q. In the following, the element with the highest ionisation energy is
A) $\lbrack Ne\rbrack 3s^{2}3p^{1}$
B) $\lbrack Ne\rbrack 3s^{2}3p^{3}$
C) $\lbrack Ne\rbrack 3s^{2}3p^{2}$
D) $\lbrack Ne\rbrack 3s^{2}3p^{4}$
Explanation
(b)
[Ne] $3s^{2}\ \ 3p^{3}$
[image:3_image6.emf]
Elements having half-filled or fully-filled orbitals are more stable. Hence, much energy is required to remove an electron from the outermost orbit. So, [Ne] $3s^{2}3p^{3}\$has highest ionisation energy.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.