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Select the sequence that shows the ions in order of increasing ionic radius (from smallest to largest): O²⁻, S²⁻, N³⁻, and P³⁻.

1. O²⁻ < N³⁻ < S²⁻ < P³⁻
2. O²⁻ < P³⁻ < N³⁻ < S²⁻
3. N³⁻ < O²⁻ < P³⁻ < S²⁻
4. N³⁻ < S²⁻ < O²⁻ < P³⁻

Correct answer: O²⁻ < N³⁻ < S²⁻ < P³⁻

Solution

The correct sequence is based on the increasing number of electron shells and the effective nuclear charge experienced by the ions. As we move from O²⁻ to P³⁻, the ionic radius increases due to the addition of electron shells and a decrease in effective nuclear charge, leading to a larger size.

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