For a crystal with r(Na⁺) = 95 pm and r(Cl⁻) = 181 pm, what coordination number does the radius ratio predict?
Correct answer B. 6
Explanation
Radius ratio = 95 ÷ 181 = 0.52, which lies in the range 0.414 to 0.732 for octahedral coordination. Each Na⁺ is therefore surrounded by 6 Cl⁻ ions.
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