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Rubidium has a surprising number of oxides. .

A number are ionic compounds and contain the expected Rb+ paired with different oxygen anions, O2-, O2- O22- , O3- These are expected even though the anions may look a bit weird.

Rubidium oxide, Rb2O, 2Rb+ O2- (the expected oxide - where oxygen fulfils its octet)

Rubidium superoxide RbO2, Rb+O2-

Rb4O6 which 4Rb+ O22- (O2- )2 lets just call it tetrarubidium hexaoxide

Rubidium peroxide

Rb2O2 , 2Rb+ O22-

Rubidium ozonide, RbO3, Rb+ O3-,

There are two other really odd compounds Rb6O and Rb9O2 which are not simple ionic compounds.

Potassium also has more oxides than expected and cesium has even more than rubidium!

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