The structure of $Na_2O$ crystal is

If the radius ratio is in the range of $0.732 - 1.000$,then the coordination number will be

$NaCl$ 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?

The packing efficiency and coordination number of face-centred cubic $(FCC)$ lattice is

What is the coordination number of sodium ions in the case of sodium chloride structure?

$Na$ and $Mg$ crystallize in $BCC$ and $FCC$ type crystals respectively,then the number of atoms of $Na$ and $Mg$ present in the unit cell of their respective crystal is