Question

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :

• A. 75 pm
• B. 300 pm
• C. 240 pm
• D. 152 pm

Answer 1

Answer: (D)

152 pm

Answer 2

For BCC structure $\sqrt{3}$a = 4r r = $\frac{\sqrt{3}}{4}a$ = $\frac{\sqrt{3}}{4} \times 351$= 152 pm.