Question

Sodium metal crystallizes in B.C.C lattice with edge length of $4.29\dot{A}$. The radius of sodium atom is

• A. 2.857
• B. 1.601
• C. 2.145
• D. 1.857

Answer 1

The correct option is D

1.857

In B.C.C., $r=\frac{\sqrt{3}}{4}a$
$r=\frac{\sqrt{3}}{4}\times 4.29=1.857\ddot{A}$