What is the total number of atom per unit cell in a hcp lattice?
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The hexagonal closest packed (hcp) has coordination number 12.It has ABCABC type of packing and contains 6 atoms per unit cell. On the other hand the face-centered cubic (fcc) has also coordination number 12 but it contains 4 atoms per unit cell.In case of the body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.
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