Multiple choice

The ions with lowest and highest radii among O2-, F-, Na+ and Mg2+ are respectively,

  1. Mg2+ and O2-

  2. O2- and F-

  3. O2- and Mg2+

  4. Na+ and Mg2+
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A Correct answer
Explanation

These are isoelectronic ions with 10 electrons. As nuclear charge increases (Mg2+ > Na+ > F- > O2-), the ionic radius decreases. Therefore, O2- has the largest radius and Mg2+ has the smallest.

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