In diamond structure, carbon atoms form fcc lattice and \( 50 \% \) tetrahedral voids occupied b...

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In diamond structure, carbon atoms form fcc lattice and \( 50 \% \) tetrahedral voids occupied by carbon atoms. Every carbon atoms is surrounded tetrahedrally by four carbon atoms with bond length \( 154 \mathrm{pm} \). Germanium, silicon and grey tin also crystallise in same way as diamond. \( \left(N_{A}=6 \times 10^{23}\right) \) The density of diamond unit cell is (in \( \mathrm{gm} / \mathrm{cm}^{3} \) ) :
(a) \( 28.48 \)
(b) \( 0.0556 \)
(c) \( 0.445 \)
(d) \( 3.56 \)
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