In a cubic close packing,the unit cell has...

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(D) The cubic close packing (ccp) is equivalent to the face-centered cubic (fcc) structure.In an fcc unit cell,the number of atoms per unit cell is $Z

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$8$ tetrahedral voids within the unit cells

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(D) The cubic close packing (ccp) is equivalent to the face-centered cubic (fcc) structure.In an fcc unit cell,the number of atoms per unit cell is $Z = 4$.The number of tetrahedral voids is given by the formula $2 	imes Z$.Therefore,the number of tetrahedral voids $= 2 	imes 4 = 8$.These $8$ tetrahedral voids are located entirely within the body of the unit cell.

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