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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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The correct Answer is:
1414 pm
For FCC, `r=a/(2sqrt2)` or `a=2sqrt2r=2xx1.414xx500` pm =1414 pm
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