If $z$ represents the number of atoms in a unit cell of a close-packed structure with an $ABCABC$ stacking sequence,then the number of tetrahedral voids in the unit cell is ....

How many unit cells share a corner of a unit cell in a crystal lattice?

In a crystal lattice,the number of octahedral voids compared to tetrahedral voids is ...............

What is the percentage of unoccupied space in $fcc$ unit cell (in $\%$)?

In the spinel structure,oxide ions are cubical-closest packed where $1/8$ of tetrahedral voids are occupied by $A^{2+}$ cations and $1/2$ of octahedral voids are occupied by $B^{3+}$ cations. The general formula of the compound having spinel structure is

The atomic radius of an $fcc$ unit cell is: