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In this, one particle is attached to 6 at the same layer & 3 to the above and below layer.Thus a total of 12.

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Q: Why is coordination number of HCP is 12?
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Related questions

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The coordination number in hexagonal close-packed (hcp) structures is 12. This means that each atom in an hcp lattice is in contact with 12 surrounding atoms.


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In a face-centered cubic (fcc) lattice, each atom is in contact with 12 nearest neighbors. This means that the coordination number of a fcc lattice is 12.


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