Lithium metal crystallises in a body-centred cubic (BCC) structure. If the length of the side of its — Solid State Chemistry Question

💡 Solution & Explanation

For a BCC unit cell, the body diagonal is $\sqrt{3}a$, which is equal to $4r$. Therefore, $r = \frac{\sqrt{3}a}{4} = \frac{1.732 \times 351}{4} \approx 151.98\text{ pm}$. Rounded to the nearest integer, it is $152\text{ pm}$.