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A metal crystallises in the 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. a 2
2. 2 a
3. 2a
4. a 2 2 Students may find similar question in CP exercise sheet : [ JEE Main, Chapter : Solid State, Solved Example, Q. No.21 ] [ JEE Advance, Chapter : Solid State, Solved Exercise-4, Q. No.4 ]

Correct answer: 2 a

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