An element with density \( 10 \mathrm{~g} \mathrm{~cm}^{-3} \) forms a cubic unit cell with edge...

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An element with density \( 10 \mathrm{~g} \mathrm{~cm}^{-3} \) forms a cubic unit cell with edge length of \( 3 \times 10^{-8} \mathrm{~cm} \). What is the nature of the cubic unit cell if the atomic mass of the element is \( 81 \mathrm{~g} \mathrm{~mol}^{-1} \) ?
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