The arrangement $ABC ABC ABC …..$ is referred to as:

What is the minimum number of spheres required to develop a tetrahedral void?

In a compound,atoms of element $Y$ form a $ccp$ lattice and atoms of element $X$ occupy $2/3$ of the tetrahedral voids. What is the formula of the compound?

In a crystal,atoms of $A$ form an $FCC$ lattice,atoms of $B$ occupy all octahedral voids,and atoms of $C$ occupy $25\%$ of the tetrahedral voids. The possible molecular formula of the compound is:

$A$ compound forms an $hcp$ structure. What is the total number of tetrahedral voids formed in $0.8 \text{ mol}$ of this compound?

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