\( \mathrm{Al} \) (at. wt 27) crystallizes in the cubic system with...

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\( \mathrm{Al} \) (at. wt 27) crystallizes in the cubic system with a cell edge of \( 4.05 \AA \). Its density is \( 2.7 \mathrm{~g} \) per \( \mathrm{cm}^{3} \). Determine the unit cell type calculate the radius of the \( \mathrm{Al} \) atom
(a) \( \mathrm{fcc}, 2.432 \AA \)
(b) bcc, \( 2.432 \AA \)
(c) bcc, \( 1.432 \AA \)
(d) fcc, \( 1.432 \AA \)
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