The coordination number of a hexagonal close-packed $(hcp)$ crystal structure is......

In $CsCl$ lattice,the coordination number of $Cs^{+}$ ion is:

The number of octahedral voids per lattice site in a lattice is $...$ (Rounded off to the nearest integer).

$A$ cubic structure is formed where atoms of element $X$ are occupied at the corners of the cube and also at the face centers. Atoms of element $Y$ are present at the body center and at the edge centers. If all the atoms are removed along a plane passing through the middle of the cube (bisecting the four edges), the formula will become

How many formula units are present in the unit cell of fluorite $(CaF_2)$?

The structure of $MgO$ is similar to $NaCl$. What would be the coordination number of magnesium?