La Rioja PAU Chemistry Practice Questions - La Rioja PAU Chemistry Examination (Química 2o Bachillerato Universidad De La Rioja 2026) Exam

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Which of the following orders correctly arranges the isoelectronic species S²⁻, Cl⁻, K⁺, and Ca²⁺ by decreasing ionic radius?

S²⁻ > Cl⁻ > K⁺ > Ca²⁺ Ca²⁺ > K⁺ > Cl⁻ > S²⁻ Cl⁻ > S²⁻ > Ca²⁺ > K⁺ K⁺ > Ca²⁺ > S²⁻ > Cl⁻

Correct Answer:

S²⁻ > Cl⁻ > K⁺ > Ca²⁺

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