In the cubic close packing, the unit cell has

(a) 4 tetrahedral voids each of which is shared by four adjacent unit cell

(b) 4 tetrahedral voids within the unit cell

(c) 8 tetrahedral voids each of which is shared by four adjacent unit cells

(d) 8 tetrahedral voids within the unit cells

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Solution

Answer: (d) In the cubic close packing the unit cell has 8 tetrahedral voids within it and are located at each eight smaller cubes of a unit cell.

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

(a) 4

(b) 8

(d) four times the number of octahedral voids

Show that in a cubic packed structure, eight tetrahedral voids are present per unit cell.

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