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

$A$ binary compound $(A^{+} B^{-})$ has a zinc blende structure where $B^{-}$ ions form the lattice and $A^{+}$ ions occupy $25\%$ of the tetrahedral voids. What is the formula of the compound?

$A$ cubic unit cell contains manganese ions at the corners and fluoride ions at the centres of each edge. The coordination number of the manganese ion is-

The fraction of void space on the body diagonal in an ideal rock salt structure is [Use : $\sqrt{6} = 2.45$]

What is the total number of ions present in one unit cell of sodium chloride lattice?

How many chloride ions are there around a sodium ion in a sodium chloride crystal?