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Among the following ions, which one has the greatest ionic radius?

1. Li⁺
2. O²⁻
3. B³⁺
4. F⁻

Correct answer: O²⁻

Solution

O²⁻ has the greatest ionic radius because it has gained two electrons, resulting in increased electron-electron repulsion and a larger size compared to the other ions listed, which have either lost electrons or gained fewer.

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