What is the total number of atoms present in an $fcc$ unit cell?

The crystal structure of $AB$ is of $NaCl$ type. If the radius of the $A^+$ ion is $x \ pm$ and the radius of the $B^-$ ion is $y \ pm$, then the edge length of the unit cell will be ..........

What is the coordination number of a cation in an ionic compound if the type of hole occupied by the cation is octahedral?

If the coordination number of an element in its crystal lattice is $8$,what will be its packing structure?

The number of nearest neighbours and next nearest neighbours of an $Na^{+}$ ion in a crystal of $NaCl$ are respectively

What is the minimum limiting radius ratio for an octahedral arrangement?