Question

Number of atom per unit cell in B.C.C. (a) 9 (b) 4 (c) 2 (d) 1.

Answer 1

In body-centred cubic (b.c.c.) lattice there are eight atoms at the comers of the cube and one at the centre as shown in the figure

Therefore number of atom per unit cell

= 1/8 x 8 + 1 = 2.