Among solids, the highest melting point is exhibited by

The unit cell with the following structure refers to______crystal system.

The crystal system of a compound with unit cell dimensions $\mathrm{a}=0.387, \mathrm{b}=0.387 \text{and} \mathrm{c}=0.504 \mathrm{nm}$ and $\mathrm{\alpha }=\mathrm{\beta }=90º \text{and} \mathrm{\gamma }=120º$ is

In a bcc unit cell, atoms are numbered as shown below. The atoms touching each other are:

For the structure given below, the site marked as $\mathrm{S}$ is a: