Q. The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is
A) 1
B) 2
C) 3
D) 4
Explanation
(c)
Since, the $IV^{th}$ IE is very high, $ie,$ electron is to be removed from stable configuration, thus it has 3 valence electrons
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.