What is the coordination number of a cation in an ionic compound if the type of hole occupied by the cation is octahedral?

What is the coordination number of $Zn^{2+}$ and $S^{2-}$ ions in the zinc blende $(ZnS)$ structure?

In a crystal of $LiI$, $I^{-}$ ions are arranged in a $ccp$ structure and $Li^{+}$ ions occupy octahedral voids. If $a = 600 \ pm$, what is the radius of the $Li^{+}$ ion in $pm$?

Find the radius of an atom in $fcc$ unit cell having edge length $393 \ pm$. (in $pm$)

In an end-centered unit cell,the body diagonal contains two additional atoms. What is the total number of atoms present in the unit cell?

Platinum crystallizes in a face-centered cubic $(FCC)$ crystal with a unit cell edge length $a$. The distance between nearest neighbour atoms is