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Xenon crystallizes in the face-centred c...

Xenon crystallizes in the face-centred cubic lattice and the edge of the unit cell is `620` pm. What is the nearest neighbour distance and what is the redius of xenon atom?

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Here, a=620 pm , d=? , r=?
For the face-centred cubic `d=a/sqrt2=620/1.414`=438.5 pm , `r=d/2=438.5/2` =219.25 pm
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