In the unit cell of NaCl, which of the following statements are correct?

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Na⁺ ions have six Cl– ions in its nearest neighbourhood

NaCl has 68% of occupied space

Cl^– ions have six Na⁺ ions in its nearest neighbourhood

Second nearest neighour of Na⁺ ion are twelve Na+ ions

answer is A, B, C.

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Detailed Solution

Co-ordination no of NaCl = 6 : 6 Na+ surrounded by 6Cl^–, Cl^– surrounded by 6Na⁺. Second nearest neighbours of Na⁺ion are 12Na⁺ i.e., The ion at the body centre is
surrounded by 4Na⁺ at edge centre (Xdirection) 4Na⁺ (X-direction), 4Na⁺ (Zdirection).

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