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The CsCl structure type is one of the simplest and most common arrangements adopted by compounds formed from two elements. The atoms of one of the elements trace out a primitive cubic lattice while the atoms of the other element go to the centers of the cubic spaces that result. As you can see, it can be formed from compounds all over the van Arkel-Ketelaar triangle. It is a great example of how the same arrangement of atoms can be used even for very different types of bonding. If you click on each of the compounds, I can tell you about the bonding they exhibit.