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NCERT Textbook
THE SOLID STATE

Class 12
Chemistry :-NCERT Solutions - The Solid State

Exercise 2
Question 21
Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell. What is the length of a side of the cell?


Answer:

Answer

We know, for a fcc unit cell,radius of atom

r = a/2√2

Or

a = 2r√2

By putting the values of r &√2 we get

a = 2 x 0.144 x 1.414 = 0.407nm


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