Rubidium sesquioxide is a chemical compound with the formula Rb2O3 or more accurately Rb4O6. In terms of oxidation states, rubidium in this compound has a nominal charge of +1, and the oxygen is a mixed peroxide (O2(2-)) and superoxide (O2−) for a structural formula of (Rb+)4(O2−)2(O2(2-)).
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