Question

The number of atoms per unit cell of body centred cube is :
(a) 1
to) 2
(c) 4
(d) 6​

Answer 1

Answer:

The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. The simple cubic has a coordination number of 6 and contains 1 atom per unit cell

Answer 2

Answer:

(b) 2

Explanation:

A body centered cubic cell (BCC) has coordination number 8. There is one atom at each of the 8 corners, where each atom has 1/8 contribution to the considered unit cell. And, for a BCC unit cell, there is an atom at the centre of the cube, which contributes fully to the unit cell. Hence, in total we get 2 atoms in a BCC unit cell.

$\frac{1}{8}\times 8 (corner) + 1 (centre) = 2$

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