In a multi layered close-packed structure :

there are twice as many tetrahedral holes as many close-packed atoms

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there are as many tetrahedral holes as many closed packed atoms

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there are twice as many octahedral holes as many close-packed atoms

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there are as many tetrahedral holes as many octahedral holes

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Solution

The correct option is A there are twice as many tetrahedral holes as many close-packed atoms
No. of octahedral holes $=$ No. of close packed atoms
No. of Tetrahedral holes $= 2 \times$ No. of close packed atoms
Hence, in a multi-layered close-packed structure, there are twice as many tetrahedral holes as many close-packed atoms.

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