The radius of an atom of an element is 5...

The radius of an atom of an element is `500` pm. If it crystallizes as a face-centred cubic lattice, what is the length of the side of the unit cell?

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For `fc c, r = (a)/(2sqrt2)`
or `a = 2 sqrt2 r = 2 xx 1.414 xx 500` pm
`= 1414` pm

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