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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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nearest neighbour distance = 2r (in FCC)
`implies asqrt(2)=4r implies 2r=(a)/sqrt(2)=(620)/(1.414)`
2r=438.47
r=219.23
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