In NaCl the nearest neighbour distance of ions is 
a) a/4
b) a(3)1/2/2
c) a/2
d) a(2)1/2​/2

Dear Student,

NaCl has a face centered cubic(fcc) structure.

Each Na+ ion has 6 Cl- ions as neighbours and each Cl- ion has 6 Na+ ions as neighbours.
Thus, the coordination number of NaCl is 6.

The nearest neighbout distance is a2.

The correct answer is option (c).

Hope it helps.

Regards

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