Chemistry Classification of Elements and Periodicity All Topic Question for Revision Test Single Correct MCQ
Published on: August 12, 2026

The second ionisation enthalpies of elements are always higher than their first ionisation enthalpies because

A
it is easier to remove electron from cation.
B
cation formed always have stable half-filled or completely filled valence shell electron configuration.
C
ionisation is an endothermic process.
D
the cation is smaller than its parent atom.

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The correct answer is:
D

The second ionisation enthalpies of elements are always higher than their first ionisation enthalpies because the cation is smaller than its parent atom.

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