Question

Lithium forms the body-centered cubic structure. The length of the side of its unit cell is $351pm$. The atomic radius of lithium will be:

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

Answer 1

The correct option is D $152pm$

For body centred cubic unit cell
$a\sqrt{3}=4r$
$r=\frac{a\sqrt{3}}{4}=\frac{351\times 1.732}{4}=152pm$.