The ratio of close-packed atoms to tetrahedral holes in cubic close packing is

How many total voids are present in $1 \ mol$ of a compound that forms an $hcp$ structure?

With the help of a labelled diagram,show that there are $4$ octahedral voids per unit cell in a cubic close-packed $(CCP)$ structure.

The correct option for the number of tetrahedral and octahedral voids in a hexagonal primitive unit cell is:

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

Find the void volume of a $bcc$ unit cell in $cm^3$ if the volume of the unit cell is $1.5 \times 10^{-22} \ cm^3$.