$A$ compound crystallizes in a $NaCl$ type structure. What is the percentage of unoccupied tetrahedral voids?

Coordination number of $Zn^{2+}$ in $ZnS$ (zinc blende) is

An example of fluorite structure is

The edge length of the unit cell of $NaCl$ crystal lattice is $552 \, pm$. If the ionic radius of the sodium ion is $95 \, pm$, what is the ionic radius of the chloride ion in $pm$?

The number of close neighbours in a body-centred cubic $(BCC)$ lattice of identical spheres is:

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