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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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The correct Answer is:
438.5 pm, 219.25 pm
Distance between nearest neighbour.
`d = a/(sqrt2) = 620/(sqrt(2)) = 438.5 ` pm
`r = d/2 = 219.25 ` pm .
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