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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. 128
B. 157
C. 181
D. 108
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Correct Answer - A
For a fcc lattice , the radius of atom is
`r=(a)/(2sqrt2)= (361)/(2xxsqrt2)=127.6=128` pm
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