Question: Rhenium forms a series of solid oxides: Re2O7 (yellow), ReO3 (red), Re2O5 (blue), and ReO2 (brown). One of them has a crystal structure with the

Rhenium forms a series of solid oxides: Re2O7 (yellow), ReO3 (red), Re2O5 (blue), and ReO2 (brown). One of them has a crystal structure with the following unit cell:

a. How many rhenium atoms (gray spheres) are there in a unit cell? How many oxygen atoms are there in the unit cell?
b. What is the color of the compound? Explain.

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