Home Chemistry Classification of Elements and Periodicity Atomic and Ionic Radius Which has smallest size ?
Chemistry Classification of Elements and Periodicity Atomic and Ionic Radius Single Correct MCQ
Published on: August 12, 2026

Which has smallest size ?

A
Na +
B
Mg 2+
C
Ne
D
O 2–

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Text Solution

Verified by Experts
The correct answer is:
B

All are isoelectronic species and thus Na + has smallest ionic radius because of high effective nuclear charge (i.e., 11 No. of protons as compared to 9, 8 and 7 in F, O and N respectively).

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