Assertion :Packing fraction of FCC and HCP unit cells are same. Reason: Both fcc and hcp unit cells have same packing pattern i.e. ABCABCABC.......
A unit cell is the smallest representation of an entire crystal. ... The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell.Both fcc and hcp unit cells does not have same packing pattern.