The coordination number of hexagonal closest packed (hcp) structure is:

12

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10

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8

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6

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Solution

The correct option is A $12$
The centre atom in layer B of HCP structure is touched with 12 other atoms of the same cell. Thus, Coordination number is 12 (Option A).

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[NCERT 1978; IIT 1999]

What is the coordination number of atoms in hcp structure?