Q.

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

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a

the number of the nearest neighbours of an atom present in the topmost layer is 12.

b

the efficiency of atom packing is 74%.

c

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

d

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

answer is B.

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Detailed Solution

CCP has a packing efficiency of 74%. The nearest neighbours in the top most layer is not 12.The number of tetrahedral and octahedral voids are 2 and 1 respectively per atom.  The edge length is 22 times the radius of atom (2a=4r)
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