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The density of copper is 8.95 g cm-3. It has a face centred cubic structure. What is the radius of copper atom? (Atomic mass Cu = 63.5 g mol-1, NA = 6.02 ×1023 mol-1)

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Concept Questions :-

Density/Formula/packing fraction/ Semiconductors

Using ρ = Z×Ma3×NA

           [Given : ρ = 8.95 g cm-3, For FCC; Z=4]

a3Z×Mρ×NA

or  a34×63.58.95×6.02×1023 = 25453.879×1023

or a = 4.714×10-233 = 47.14×10-243

= 3.613×10-8 cm

 

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