Rhenium oxide does not have a close-packed structure. Its structure can be best described as a simple cubic array of rhenium ions with the oxide ions at the center of each edge of the cubic unit cell. What is the charge of the rhenium ion in this compound? 7. 8. An oxide of titanium crystallizes in the unit cell shown here (titanium = grey; oxygen = red). What is the formula of the ionic compound? %3D

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