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Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?A. 108 pmB. 127 pmC. 157 pmD. 181 pm

Answer» Correct Answer - B
In fcc unit cell, (a=361 pm)
`4r=sqrt(3)a`
`r=(sqrt(3))/(4)a`
`=(sqrt(3))/(4)xx361`
`r=127pm`


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