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Packing Fraction and Efficiency

The coordinat...

Question

The coordination number for a HCP unit cell is:

A

4

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B

6

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C

8

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D

12

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Solution

The correct option is D 12
Coordination Number in hcp :
In hcp lattice
Each sphere touches 6 spheres in its layer +3 spheres below the layer+3 spheres,above the layer
So, the coordination number is 12

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