Lithium metal crystallizes in a BCC framework. If the length of the side of the unit cell is , the a — Solid State Chemistry Question

💡 Solution & Explanation

In a BCC unit cell, atoms touch along the body diagonal, so $4r=\sqrt{3}a$. Hence $r=\frac{\sqrt{3}a}{4}=\frac{1.732\times351}{4}\text{ pm}\approx151.9\text{ pm}$.