Q. A sudden large jump between the value of first and second ionisation energies of elements would be associated with which of the following electronic configurations?
A) $1s^{2},2s^{2}2p^{6},3s^{1}$
B) $1s^{2},2s^{2}2p^{6},3s^{2}3p^{1}$
C) $1s^{2},2s^{2},2p^{6},3s^{1}3p^{2}$
D) $1s^{2},2s^{2}2p^{6},3s^{2}$
Explanation
(a)
$1s^{2},2s^{2},2p^{6},3s^{1}$configuration represents the Na, because the atomic number of Na is 11. The first ionisation energy is less than second ionisation energy because $IE_{2}$involves the removal of an electron from the stable configuration ($i.e.,\ 1s^{2},2s^{2},2p^{6})\$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.