Q 21: Gold
(atomic radius = 0.144 nm) crystallises in a face–centred unit cell. What is
the length of a side of the cell?
Solution:
Given that
Radius of atom R= 0.144 nm
For a face–centered unit cell
Edge a = 2√2 R
Plug the values we get
Edge a= 0.144 x 2 x 1,414 nm
Edge a= 0.407 nm
Solution: :– The length of a side of
the cell = 0.407 nm
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