which of the following statemets is not true about the hexagonal close packing ?

Options

A. The coordination number is 12
B. It has 74% packing efficiency
C. 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 thoseof the first layer

Answer

D

Explanation

In hexagonal close packing,it is the third layer,spheres of which are exactly aligned with those of the first layer. Other given statements are ture.