In a face-centered cubic $(FCC)$ unit cell,what fraction of an atom located at the face center is shared by one unit cell?

What is the coordination number of sodium ions in the case of sodium chloride structure?

If $AB$ crystallizes in a zinc blende structure with $B^{-}$ ions at lattice points,what fraction of tetrahedral voids is occupied by $A^{+}$ ions? (Express as a percentage)

In a simple cubic unit cell,how many unit cells share each lattice point located at the corner?

In sodium chloride,$Cl^-$ ions form a $ccp$ arrangement. In this structure,where are the $Na^+$ ions located?

An element has a body-centered cubic $(BCC)$ structure with an edge length of $288 \ pm$. The density of the element is $7.2 \ g/cm^3$. How many atoms are present in $208 \ g$ of the element?