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

The number of atoms present in a simple cubic unit cell of a molecular substance is.....

In a $ccp$ lattice of $X$ and $Y$,$X$ atoms are present at the corners while $Y$ atoms are at face centers. What would be the formula of the compound if one of the $X$ atoms from a corner is replaced by a $Z$ atom?

All of the following share the same crystal structure except:

How many total constituent particles are present in a simple cubic unit cell?

What is the limiting radius ratio for a tetrahedral shape?