First slide

Ionic solids

Question

Select the correct statement(s) for the rock-salt structure (NaCl)

Moderate

A

The tetrahedral voids are smaller than the octahedral sites
B

The octahedral voids are occupied by cations and the tetrahedral sites are empty
C

The radius ratio (r_c/r_a) is 0.225
D

the radius ratio (r_c/r_a) is 0.732

Solution

sodium chloride crystal has the radius ratio of 0.52

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