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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 pm
B. 157 pm
C. 181 pm
D. 108 pm
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Correct Answer - A
In case of face centred cubic (fcc) lattice,
`"radius"=(sqrt2a)/(4)`
`therefore` Radius of copper atom (fcc lattice)
`(sqrt2xx361)/(4)=128" pm"`
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