Q. The successive ionisation energy values for an element ‘X’ are given below Ist ionisation energy =410 kJ $mol^{- 1}$ 2nd ionisation energy =820 kJ $mol^{- 1}$ 3rd ionisation energy =1100 kJ $mol^{- 1}$ 4th ionisation energy =1500 kJ $mol^{- 1}$ 5th ionisation energy =3200 kJ $mol^{- 1}$ Find out the number of valence electron for the atom ‘X ’
A) 4
B) 3
C) 5
D) 2
Explanation
(a)
The ionisation energy values for valence electrons are comparable to remove electrons from inner shell very high amount of energy is needed. In the given values there is a biggest jump between $IE_{4}$and $IE_{5}$. Hence, there are four valence electrons for the atom $X$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.