Aluminium crystallizes in an fcc structure. Atomic radius of the metal – InterviewSolution

1.	Aluminium crystallizes in an fcc structure. Atomic radius of the metal is 125 pm. What is the length of the edge of the unit cell ?
Answer» Solution : For a face centred CUBIC CLOSE PACKED structure, Radius (r) = `a// 2sqrt2` `:.` LENGTH of the side of the unit cell, `a = 4/sqrt2 r = 2sqrt2 r = 2xx 1.4142 xx 125 xx 10^(-12) m = 3.535 xx 10^(-10) m` = 353.5 pm

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