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Q.

A metal crystallizes in a F.C.C structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be

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a

22a

b

2a

c

a2

d

2a

answer is A.

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Detailed Solution

In F.C.C unit cell atoms are in contact Face diagonal 2a=4R
2R=2a2=a2

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A metal crystallizes in a F.C.C structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be