Which of the following statement is not true about the hexagonal … - Vidyadip

MCQ

Which of the following statement is not true about the hexagonal close packing?

A
The coordination number is $12.$
B
It has $74\%$ packing efficiency.
✓
Tetrahedral voids of the second layer are covered by the spheres of the third layer.
D
In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer.

✓

Answer

Correct option: C.

Tetrahedral voids of the second layer are covered by the spheres of the third layer.

In hexagonal close packed structure there is $\text{ABAB} ......$ type pattern. This means that in this case spheres of third layer are exactly aligned with those of the first layer. Thus the pattern of spheres is repeated in alternate layers. Thus the statement at $(iv)$ is not true about hexagonal closed packing.

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