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NCERT Class XII Chemistry
Chapter - The Solid State
Questions with Solutions

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Question : 21 of 50
Marks: +1, -0
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 r=0.144 nm,a=?r=0.144\, \text{nm}, a=?
For fcc,a=22rfcc, a=2\sqrt{2} r
=2×1.414×0.144 nm=2\times 1.414\times 0.144\, \text{nm}
=0.407 nm=0.407\, \text{nm}
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