The CORRECT statement(s) for cubic close packed (ccp) three dimensional structure is (are)

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The number of the nearest neighbours of an atom present in the topmost layers is 12

The efficiency of atom packing is 74%

The number of octahedral and tetrahedral voids per atom are 1 and 2, respectively

The unit cell edge length is 22 times the radius of the atom

answer is B.

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Detailed Solution

Packing fraction = Vol.ofatom Vol.of unit cell ×100=4×43πr3a3×100=4×43πr3(22r)3×100∣=74%

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