Problem: The rutile and fluorite structures, shown here (anions are colored green and are the larger of the two spheres), are two of the most common structure types for ionic compounds where the cation-to-anion ratio is 1:2.What are the coordination numbers of the cations and anions in the rutile structure?

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The rutile and fluorite structures, shown here (anions are colored green and are the larger of the two spheres), are two of the most common structure types for ionic compounds where the cation-to-anion ratio is 1:2.

Rutile is a rectangular cuboid with cations at its corners and two rows of three anions inside. Fluorine is a cube with cations at its corners and face centers and anions inside.

What are the coordination numbers of the cations and anions in the rutile structure?

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