The number of tetrahedral voids per unit cell in NaCl crystal is

The number of tetrahedral voids per unit cell in NaCl crystal is
 (c) twice the number of octahedral voids
 (d) four times the number of octahedral voids

1 Answer

  1. NaCl has fcc arrangement of Cl ions. Hence, number of Cl ions in packing per unit cell = 4.
    NO. of tetrahdral voids is double the number of octahedral voids. Hence, tetrahedral voids = 4.

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