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The edge of the face-centred cubic unit ...

The edge of the face-centred cubic unit cell of aluminium is 404 pm. Calculate the radius of almunium atom.

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`d = 2r = (a)/(sqrt(2))`
`therefore r = (a)/(2 sqrt(2))`
`= (404)/(2 xx 1.4)`
= 142.9 pm
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