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

1. O²⁻
2. B³⁺
3. Li⁺
4. F⁻

Correct answer: O²⁻

Solution

O²⁻ has the largest 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 either have fewer electrons or are positively charged.

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