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# Copper crystallises in face centred cubic lattice and has density of 8.930 $g cm^{−3}$ at 293 K. Calculate the radius of copper atom. [Atomic mass of Cu= 63.55 u, $N_A =6.02 × 10^{23} mol^{−1}$]

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$1.27\times 10^{-8}$
Hence (A) is the correct answer.
answered Jun 2, 2014