The compound CsCl has

For $r_{{\mathrm{Cs}}^{+}/r_{{\mathrm{Cl}}^{-}}}>0.732$ hence, CsCl forms body-centred cubic unit cell.

Lattice points that appear not only at the corners but also in the middle of the unit cell are designated as body-centered cubic (BCC) unit cells. Along the diagonal of the cube, the atoms touch one another, but they don't touch the cube's edge. Every atom is the same.