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Aluminium crystallises in a cubic close ...

Aluminium crystallises in a cubic close packed structure. Its metallic radius is 125 pm.
What is the length of the side of the unti cell ?

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Cubic closed packed structure is same as face centred cubic close packing, For fcc, `a=2sqrt(2)r`
`=2xx1.414xx125"pm"`
`=354"pm"=354xx10^(-10)"cm"`
`=3.54xx10^(-8)"cm"`
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