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Q.Aluminium crystallizes in a cubic close packed structure. Its metallic radius is 125 pm. Calculate the edge length of unit cell.

Puducherry TnboardTamil Nadu HSC (DGE) Board 2024Subjective· 3mImportance★★★★★
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In an FCC (cubic close packed) lattice, atoms touch along the face diagonal, giving 4r=2 a4r=\sqrt2\,a, i.e. a=22 ra=2\sqrt2\,r; substituting Al's metallic radius r=125r=125 pm gives a≈353.6a\approx353.6 pm.

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