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Copper has the fcc crystal structure . A...

Copper has the fcc crystal structure . Assuming an atomic radius of 130 pm for copper atom (Cu = `63.54`) . What is the volume of the unit cell ?

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The correct Answer is:
B
As we know `r=(nxxM_(m))/(N_(a)xxa^(3))`, volule of unit cell `=a^(3)`
`(3.67xx10^(-8)cm)^(3)=4.94xx10^(-23)cm^(3)`
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