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Which of the following sequences of ionic sizes is accurate?

1. F⁻ is larger than Na⁺, which is larger than Mg²⁺
2. Al³⁺ is bigger than O²⁻, which is bigger than N³⁻
3. P³⁻ is greater in size than S²⁻, which is greater than Cl⁻
4. H⁻ has a larger radius than H⁺, which is larger than He

Correct answer: P³⁻ is greater in size than S²⁻, which is greater than Cl⁻

Solution

The ionic sizes follow the trend P³⁻ > S²⁻ > Cl⁻ due to the increase in nuclear charge and decrease in electron cloud size, making it the accurate sequence.

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