How many atoms are present in a face centred cubic unit cell?

Corner : 8 x 1/8 = 1 and Face:6x ½ = 3, therefore total 4 atoms. The face-centred cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The atoms in the corner are shared by 8 unit cells and thus contributes to 1/8 of itself to the crystal lattice.

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