In this video I confirm that the white solid suspected of being rubidium bromide (see the previous video) is indeed the expected product. I reacted a solution of the suspect rubidium bromide with sodium silicomolybdate to obtain a bright yellow precipitate. I then reacted the remaining RbBr solution with tellurium tetrabromide in concentrated HBr and I obtained a precipitate here as well. This confirms the presence of rubidium to the limits of my capabilities.

In the rest of the video I demonstrate the synthesis of two different thorium compounds. Cs3ThCl7 was made by combining 3 molar equivalents of cesium chloride with a solution of thorium tetrachloride and then evaporating down the mixture to obtain the solid. Thorium superoxide was made by reacting thorium(IV) hydroxide with 35% hydrogen peroxide.

How To Make Sodium Silicomolybdate: https://www.youtube.com/watch?v=Sft2cz5--Yg&t=515s
Atomistry Thorium Superoxide: http://thorium.atomistry.com/thorium_superoxide.html
Atomistry Tricesium Heptachlorothorium(IV) http://thorium.atomistry.com/complex_thorium_chlorides.html

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