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Q.

 An element having an atomic radius of 0.14nm crystallizes  in an fcc unit cell. What is the length of a side of the cell? 

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a

0.56 nm

b

0.24 nm

c

0.96 nm

d

0.4 nm

answer is D.

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Detailed Solution

 For a fcc unit cell  r=2a4 a=4r2=22×0.14=0.390.4nm.

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 An element having an atomic radius of 0.14nm crystallizes  in an fcc unit cell. What is the length of a side of the cell?