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(B) In a face-centered cubic $(FCC)$ or cubic close-packed $(CCP)$ structure,the arrangement follows an $ABCABC...$ pattern. In the $ABC$ arrangement,

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Octahedral

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(B) In a face-centered cubic $(FCC)$ or cubic close-packed $(CCP)$ structure,the arrangement follows an $ABCABC...$ pattern. In the $ABC$ arrangement,the first layer is $A$,the second layer is $B$,and the third layer is $C$. The second layer $(B)$ covers the tetrahedral voids of the first layer $(A)$. The third layer $(C)$ covers the octahedral voids created between the first and second layers.

In a face-centered cubic $(FCC)$ close-packed structure,the third layer covers the ..... voids created between the first and second layers.

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