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The statement (s) that are correct about the species O 2– , F – , Na + and Mg 2+ . (A) All are isoelectronic (B) All have the same nuclear charge (C) O 2– has the largest ionic radii (D) Mg 2+ has the smallest ionic radii Choose the most appropriate answer from the options given below :

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

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

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