If Z is the number of atoms in the unit cell | vedclass

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(B) In a cubic close-packed $(CCP)$ or face-centered cubic $(FCC)$ system,the arrangement of layers follows the $ABCABC...$ pattern.In this system,the

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$2Z$

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(B) In a cubic close-packed $(CCP)$ or face-centered cubic $(FCC)$ system,the arrangement of layers follows the $ABCABC...$ pattern.In this system,the number of atoms per unit cell $(Z)$ is $4$.The number of tetrahedral voids in a crystal lattice is always twice the number of atoms present in the unit cell.Therefore,if the number of atoms per unit cell is $Z$,the number of tetrahedral voids is $2Z$.

If $Z$ is the number of atoms in the unit cell that represents the closest packing sequence $ABCABC .....,$ the number of tetrahedral voids in the unit cell is

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