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A metal crystallises in a face-centred c...

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-

A

`sqrt2a`

B

`a/sqrt2`

C

2a

D

`2sqrt2a`

Text Solution

Verified by Experts

The correct Answer is:
B
If the radius of atom is r, then the minimum distance between two atoms in fcc unit cell = 2r.
Again for fcc, `r=a/(2sqrt2)or,2r=a/sqrt2`.
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