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Copper has the fcc crystal structure.Assuming an atomic radius of 130pm for copper atom (Cu = 63.54).What is the length of unit cell of Cu?

$\begin{array}{1 1}3.6769\times 10^{-8}cm\\2.6769\times 10^{-8}cm\\1.6769\times 10^{-8}cm\\4.6769\times 10^{-8}cm\end{array} $

1 Answer

For fcc structure
$4r=\sqrt 2a$
$\Rightarrow a=2\sqrt 2 r$
$\Rightarrow 2\sqrt 2\times 130pm =367.69pm$
$\Rightarrow 3.6769\times 10^{-8}$ cm
answered Aug 1, 2014 by sreemathi.v