Which of the following ions has the largest radius?
Answer and explanation
Correct answer: D. S²⁻
- Step 1: These ions have the same number of electrons (18), so the one with the fewest protons, sulphur with 16, is largest. Answer: S²⁻. Why not the others: Cl⁻, K⁺ and Ca²⁺ don't fit.
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