Question

What is the value of Z (no. of the atoms) in the α-Fe structure?

(a) 1

(b) 2

(c) 3

(d) 4

I have been asked this question during an interview.

My question comes from Definitions in section X-Ray Diffraction of Solid State Chemistry

Answer 1

Correct answer is (b) 2

For explanation I would say: In the α-Fe structure there are corner atoms present which contributes 1/8 thus giving (8 x 1/8=1) and a boy centered atom present in the center of the body. Hence, there are 2 atoms per unit cell in this structure.