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the number of tetrahedral voids per uni...

the number of tetrahedral voids per unit cell in NaCl crystal is ………… .

A

4

B

8

C

twice the number of octahedral voids

D

four times the number of octahedral voids .

Text Solution

Verified by Experts

The correct Answer is:
b,c
NaCl has fcc arrangement of `Cl^-` ions. Hence, number of `Cl^-` ions in packing per unit cell =4. No. of tetrahedral voids is double the number of octahedral voids. Hence, tetrahedral voids =8
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