The number of nearest neighbours in a $BCC$ unit cell is

$A$ cubic unit cell contains manganese ions at the corners and fluoride ions at the centres of each edge. The coordination number of the manganese ion is-

What is the nature of octahedral holes (voids)?

$NaCl$ is a $FCC$ lattice where $Na^{+}$ ions are at corner and face centre positions. Chloride ions are at edge centres and body centre positions. How many $NaCl$ formula units will be in a unit cell?

In an end-centered unit cell,the body diagonal contains two additional atoms. What is the total number of atoms present in the unit cell?

If the length of the body diagonal of a $FCC$ unit cell is $x \ \mathring{A}$,the distance between two nearest octahedral voids in the cell in $\mathring{A}$ is