In a hexagonal closest packing in two layers one above the other, the coordination number of each sphere will be:

4

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6

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8

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9

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Solution

The correct option is B $6$
In hexagonal closest packing, each atom is in contact with $6$ atoms above and $6$ atoms below it in a unit cell. Thus, coordination number per atom is going to be $12$ and $6$ for single unit cell.

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Similar questions

	Column I		Column II
(i)	Square close packing in two dimension	(p)	Triangular voids
(ii)	Hexagonal close packing in two dimensions	(q)	Pattern of spheres is repeated in every fourth layer
(iii)	Hexagonal close packing in three dimension	(r)	Coordination number=4
(iv)	Cubic close packing in three dimension	(s)	Pattern of spheres is repeated in alternate layers

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

(d) In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer