Home Chemistry Classification of Elements and Periodicity Ionisation Energy A large difference between the third and fou…
Chemistry Classification of Elements and Periodicity Ionisation Energy Single Correct MCQ
Published on: August 13, 2026

A large difference between the third and fourth ionization energies indicates the presence of:

A
4 valence electrons in an atom
B
5 valence electrons in an atom
C
3 valence electrons in an atom
D
2 valence electrons in an atom

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Verified by Experts
The correct answer is:
C

For possible ns 2 np 1 configuration, the removal of fourth electron will be possibly from an inert gas electron configuration. So there will be high jump in the fourth ionization enthalpy than the third ionization enthalpy which will take place from ns 1 electron configuration.

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