Q. Sodium metal crystallizes as a body centred cubic lattice with the cell edge 4.29 $\mathring{\mathrm{A}}.\$ What is the radius sodium atom?
A) $1.857 \times 10^{- 8}cm$
B) $2.371 \times 10^{- 7}cm$
C) $3.817 \times 10^{- 8}cm$
D) $9.312 \times 10^{- 7}cm$
Explanation
(a)
Radius of Na(if bcc lattice)$= \frac{\sqrt{3}a}{4} = \frac{\sqrt{3}\ \times \ 4.29}{4}\ \mathring{\mathrm{A}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.