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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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