In a hexagonal close-packed $(HCP)$ structure,the third layer covers the ........ holes created between the first and second layers.

  • A
    Tetrahedral
  • B
    Octahedral
  • C
    Both
  • D
    None of these

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$(iii)$ Tetrahedral void and octahedral void?

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What type of crystal structure from the following has $52.36 \%$ packing efficiency?

The total number of voids (octahedral + tetrahedral) in $1$ mole of a compound forming a hexagonal close-packed $(HCP)$ structure is:

$A$ metal forms an $fcc$ structure. Calculate the volume of the $fcc$ unit cell in $\text{cm}^3$ if the void volume is $1.66 \times 10^{-23} \text{ cm}^3$.

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