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Copper crystallises in face-centred cubic lattice and has a density of 8.930 g cm^−3 at 239 K. Calculate

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Copper crystallises in face-centred cubic lattice and has a density of 8.930 g  cm−3 at 239 K. Calculate the radius of Copper atom. [At. mass of Cu = 63.55 u, Avogadro’s constant NA = 6.02 x 1023 mol-1]

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√2 a = 4r (in fcc structure, analyze diagonal of a face)

r = 127.8 pm

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