The coordination number of a sphere in a face-centered cubic $(fcc)$ lattice is .....

The coordination number in $hcp$ is

In a compound $AB$, $A$ atoms occupy the corners of the cube and the $B$ atoms occupy the body centre of the cube. If the $A$ atoms possess magnetic moment due to up-spin and $B$ atoms possess magnetic moment due to down-spin, the magnetic nature of the compound $AB$ in an isolated unit cell is

The structure of $Na_2O$ crystal is

The number of $Cl^{-}$ ions around one $Na^{+}$ in $NaCl$ crystal lattice is

The crystal $AB$ has a structure similar to $NaCl$. Atoms of $A$ are present at each corner of the cubic unit cell. If all atoms along one of the axes passing through the face centers are removed,what will be the resulting stoichiometry?