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Aluminium crystallizes in a cubic close ...

Aluminium crystallizes in a cubic close packed structure .Its metallic radius is 125pm. Calculate the edge length of unit cell.

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For the cubic close- Packed structure let a be the edge of the cube and r be the radius of atom.
G.T. r =125 pm
a =`2sqrt(2) r `
Plug the value of r we get
`=2 xx 1.414 xx125 `pm
=354 pm ( approx).
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