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# A metal crystallises in a face centred cubic structure.

Question:

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 :-

1.  2a

2. $2 \sqrt{2} a$

3. $\sqrt{2} a$

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

Correct Option: , 4

Solution: