Why is the first ionization energy of alkaline earth metals higher than that of alkali metals?

S-BLOCK ELEMENTS MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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S-BLOCK ELEMENTSchemistry-mcqs › s-block-elements
Published
18 Mar 2019
Last updated
28 May 2026

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Explanation

The first ionization energy of alkaline earth metals is greater than that of alkali metals primarily because alkaline earth metals have smaller atomic sizes, resulting in a stronger attraction between the nucleus and the outermost electron, which requires more energy to remove.

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