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Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?

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Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?
A. 181 pm
B. 108 pm
C. 128 pm
D. 157 pm
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Correct Answer - B
In fcc unit cell 4r `=sqrt(2)a`
[ r = radius of Cu atom a = edge length ]
So, `r=(sqrt(2a))/(4)rArrr=(sqrt(2)xx361)/(4)=127` pm
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