Ncert Exercises & Solutions

In the cubic close packing, the unit cell has ......... .

1.	4 tetrahedral voids each of which is shared by four adjacent unit cells.
2.	4 tetrahedral voids within the unit cell.
3.	8 tetrahedral voids each of which is shared by four adjacent unit cells.
4.	8 tetrahedral voids within the unit cells.

HINT: Number of tetrahedral void = 2

\times

number of octahedral void

Explanation: In the cubic close packing the unit cell has 8 tetrahedral voids within it and are located at each eight smaller cube of an unit cell.

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