Tetragonal crystal system has the following unit cell dimensions:

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

Which among the following metals crystallises as a simple cube?

In a face-centred cubic cell, an atom at the face contributes to the unit cell

In the crystals, which of the following ionic compounds would you expect maximum distance between centres of cations and anions?    

If we know the ionic radius ratio in a crystal of ionic solid, what can be known of the following?