The number of nearest neighbours in a $BCC$ unit cell is

In $NaCl$ lattice,the coordination number of $Cl^{-}$ ion is:

Explain the calculation of the number of atoms in a primitive cubic unit cell.

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

The structure of $ZnS$ is

$A$ crystal is formed by two elements $X$ and $Y$ in a cubic structure. $X$ atoms are at the corners of a cube,while $Y$ atoms are at the face centers. The formula of the compound will be: