Home Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Electronic Configuration and Physical Properties of Alkali Metals The first ionisation energies of alkaline ea…
Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Electronic Configuration and Physical Properties of Alkali Metals Single Correct MCQ
Published on: August 13, 2026

The first ionisation energies of alkaline earth metal are higher than those of the alkali metals. This is because:

A
there is increase in the nuclear charge of the alkaline earth metal
B
there is decrease in the nuclear charge of the alkaline earth metal
C
there is no change in the nuclear charge
D
none of these

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Verified by Experts
The correct answer is:
A

Along the period from left to right, atomic number increases and, therefore, nuclear charge also increases. So first ionization energy of alkaline earth metals are higher than those of the alkali metals of the same period because of higher nuclear charge.

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