A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is 'a'. the closest approach between two atoms in metallic crystal will be:

Engineering

Chemistry

HCP and CCP Arrangement

Question

$\sqrt{2} a$

$\frac{a}{\sqrt{2}}$

$2 \sqrt{2} a$

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Closest approach between two atoms = 2r

$= \frac{\sqrt{2} a}{2} = \frac{a}{\sqrt{2}}$