In $CsCl$ structure,the coordination number of $Cs^{+}$ is

An ionic compound has unit cells consisting of $A$ ions at the corners of a cube and $B$ ions on the centres of the faces of the cube. The empirical formula of this compound is

The coordination number of a metal crystallizing in a hexagonal close-packed $(hcp)$ structure is:

If all ions touching an axis passing through two opposite face-centres of unit cell are removed in $NaCl$ (rock salt) structure in which $Cl^{-}$ ions form $CCP$ and $Na^{+}$ ions occupy all octahedral voids,then the effective number of $Cl^{-}$ ions per unit cell is:

The ratio of the effective number of atoms in a unit cell of $fcc$ and $bcc$ lattices is

Calculate the number of atoms per unit cell in a face-centered cubic $(fcc)$ unit cell.