A metallic element has a cubic lattice. Each edge of the unit cell ...

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A metallic element has a cubic lattice. Each edge of the unit cell is \( 2 \AA \). The density of the metal is \( 2.5 \mathrm{~g} \mathrm{~cm}^{-3} \). The unit cells in \( 200 \mathrm{~g} \) of metal are
(a) \( 1 \times 10^{24} \)
(b) \( 1 \times 10^{20} \)
(c) \( 1 \times 10^{22} \)
(d) \( 1 \times 10^{25} \)
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