In a body-centered cubic $(BCC)$ unit cell,the atom at the body center is shared by how many unit cells?

If the radius ratio for an ionic solid is $0.5248$ and the radius of the cation is $0.95 \ \mathring{A}$,what is the radius of the anion?

In $F.C.C.$,each face of the unit cell is shared equally by how many unit cells?

An ionic compound is expected to have a tetrahedral structure if the radius ratio $r_{+} / r_{-}$ lies in the range of:

The unit cell of a $NaCl$ lattice:

$CsBr$ crystal has $bcc$ structure. It has an edge length of $4.3 \ \mathring{A}$. The shortest interionic distance between $Cs^{+}$ and $Br^{-}$ ions is ................ $\mathring{A}$.