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The statement (s) that are correct about the species O2-, F-, Na+ and Mg2+. (A) All are isoelectronic (B) All have the same nuclear charge (C) O2- has the largest ionic radii (D) Mg2+ has the smallest ionic radii Choose the most appropriate answer from the options given below :

1. (A), (B), (C) and (D)
2. (B), (C) and (D) only
3. (C) and (D) only
4. (A), (C) and (D) only

Correct answer: (A), (C) and (D) only

Solution

Options (A), (C), and (D) are correct because O2-, F-, Na+, and Mg2+ all have the same electron configuration, making them isoelectronic. Among these ions, O2- has the largest ionic radius due to having the most electrons and the least effective nuclear charge, while Mg2+ has the smallest ionic radius because it has the highest positive charge, pulling its electrons closer to the nucleus.

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