page_title: Alkali metal oxide
section_title: Alkali metal suboxides
hierarchical_section_title: Alkali metal oxide / Alkali metal suboxides
caption_attribution_description: Cs11O3 clusetr in Cesium suboxides
context_page_description: The alkali metals react with oxygen to form several different compounds: suboxides, oxides, peroxides, superoxides, and ozonides. They all react violently with water.
context_section_description: Hexarubidium monoxide (Rb₆O) h
  Nonarubidium dioxide (Rb₉O₂)
  Caesium monoxide (CsO)
  Tricaesium monoxide (Cs₃O) is a dark green solid.
  Tetracaesium monoxide (Cs₄O)
  Heptacaesium monoxide (Cs₇O)
  Tricaesium dioxide (Cs₃O₂)
  Heptacaesium dioxide (Cs₇O₂)
  Undecacaesium trioxide (Cs₁₁O₃)
  Undecacaesium monorubidium trioxide (Cs₁₁RbO₃)
  Undecacaesium dirubidium trioxide (Cs₁₁Rb₂O₃)
  Undecacaesium trirubidium trioxide (Cs₁₁Rb₃O₃)
caption: Structure of undecacaesium trioxide.
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