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

Options

A. 4
B. 8
C. twice the number of octahedral voids
D. Four times the number of octahedral voids

Answer

B,C

Explanation

NaCl has a rock salt type stucture having fcc arrangement
total number of atoms pe unit cell =4
`therefore` Number of tetrahedral voids `=2xx4=8`
Number of octrahedral voids =4
Hence (b) and ( c) are correct choices.