Determine the composition of a compound based on the ReO₃ structure, Exercise 4.17, where each of the oxide ions is replaced by a hydroxide ion [OH]⁻. Predict, based on commonly adopted oxidation states, which elements in the periodic table might have hydroxides that adopt this structure type.

Data from Exercises 17

The ReO₃ structure is cubic with a rhenium atom at each corner of the unit cell and one oxygen atom on each unit cell edge midway between the rhenium atoms. Sketch this unit cell and determine the coordination numbers of the ions. The identity of the structure type that would be generated if a cation were inserted in the centre of each ReO₃ unit cell.