Question

The number of atoms contained in a fcc unit cell of a monoatomic substance is (a) 1 (b) 2 (c) 4 (d) 6

Answer 1

Face-centred cubic unit cell (F.C.C): A unit cell contains one constituent particle present at the centre of each face, along with eight particles at its corners.

12

No.of atoms present in this unit cell = (8 x 1/8) + (6 x ½) = 1 + 3 = 4