$Xe$ crystallizes in an $fcc$ structure. If the edge length of the unit cell of $Xe$ is $620 \, pm$, then the distance between two nearest $Xe$ atoms is .............. $pm$.

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

What are two types of crystal structures shown by ice at different pressures?

The coordination number of the sphere in cubic close packed $(ccp)$ structure is

An element crystallizes in a structure such that the unit cell is a cube with one atom at each corner and two atoms on its body diagonal. If the volume of this unit cell is $24 \times 10^{-24} \, cm^3$ and the density of the element is $7.2 \, g \, cm^{-3}$,calculate the number of atoms present in $200 \, g$ of the element.

For $bcc$ cubic coordination the value of radius ratio is