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Gold (atomic radius = 0.144 nm) crystall...

Gold (atomic radius = 0.144 nm) crystallizes in a face centered unit cell . What is the length of a side of the unit cell ?

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In a fcc unit cell
The edge length a = `2sqrt2 ` r
Given r = 0.144` nm
`= 2 xx 1.414 xx 0.144 = 0.407 ` nm.
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