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### What is the number of atoms on one unit cell of HCP?

ANALYSIS OF HCP UNIT CELL:
Number of effective atoms in HCP unit cell (Z):
Lattice point:  corner- total 12 carbon contribute 1/6 to the unit cell
Lattice point:   face- total face 2 contribute ½
Lattice point: body centre- total atom 3 (100% contribution)