The compound AB crystallizes in a cubic lattice m which both A and B atoms have coordinatio number of 8. To what crystal class does the unit cell belong?

There are three varieties of cubic crystals: simple, body-centered, and face-centered. An illustration of a body-centered crystal lattice is $\left[\mathrm{text}\right(\mathrm{CsCl}\left)\right]$. All eight of the corner atoms in this lattice are near neighbours to the central atom. So, eight is the coordinating number.