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Xenon is crystallized in the fcc lattice...

Xenon is crystallized in the fcc lattice and the edge of unit length is 620 pm. What is the nearest neighbour distance and radius of xenon atom ?

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Edge length, a = 620 pm. For fcc lattice, nearest neighbour distance, `d = a sqrt2`
`= (620)/(sqrt2) =(620)/(1.414) = 438.3` pm
For fcc lattice, radius of atom,
`r=(a)/(2sqrt2)=(620)/(2 xx 1.414)`
= 219.25 pm
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