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NEET levelSingle correct optionDifficulty 1 of 3ss058

For atoms of radius $r$ in a bcc lattice, the edge length $a$ is related to $r$ by

A $a = 2 r$
B $a = 22 r$
C $a = \frac{4 r}{3}$
D $a = \frac{4 r}{2}$

Answer: C

In bcc the atoms touch along the body diagonal of length

3 a

, which holds

4 r

. Hence

a = 4 r / 3

.

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