The unit cell of CsCl is a simple cubic. Lattice points are located only at the corners of the cell.

Chloride ions are located on the lattice points of the unit cell commonly used to describe the CsCl structure.

A cesium ion is located at the center of the cube.

Because the atom at the center of the cell is different from the atoms at the corners, the unit cell is simple cubic, not body-centered.

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