Chemical elements
    Physical Properties
    Chemical Properties
      Rubidium hydride
      Rubidium fluoride
      Rubidium chloride
      Rubidium bromide
      Rubidium iodide
      Rubidium chlorate
      Rubidium perchlorate
      Rubidium iodate
      Rubidium periodate
      Rubidium monoxide
      Rubidium peroxides
      Rubidium hydroxide
      Rubidium peroxide hydrate
      Rubidium sulphides
      Rubidium sulphate
      Rubidium hydrogen sulphate
      Rubidium persulphate
      Rubidium thiosulphate
      Rubidium dithionate
      Rubidium trithionate
      Rubidium tetrathionate
      Rubidium selenate
      Rubidium tellurates
      Rubidium nitride
      Rubidium hydrazoate
      Rubidium nitrite
      Rubidium nitrate
      Rubidium phosphide
      Rubidium phosphates
      Rubidium carbide
      Rubidium carbonate
      Rubidium hydrogen carbonate
      Rubidium percarbonate
      Rubidium pentaborate
    PDB 1dge-461d

Rubidium peroxides

Three peroxides have been prepared by the action of excess of oxygen on the metal. The dioxide, Rb2O2, forms yellow needles melting about 600° C., and of density 3.65 at 0° C. Its heat of formation from the elements is about 107.6 Cal. The trioxide, Rb2O3, is produced by heating the metal with the theoretical proportion of oxygen, and is a black solid, melting below 500° C., and of density 3.53 at 0° C. It dissolves readily in water, forming hydrogen peroxide, and evolving oxygen. Its heat of formation from the elements is about 125.6 Cal. The tetroxide, Rb2O4, is formed as a yellowish-brown substance by the action of oxygen at reduced pressure on the metal, or as a brownish-black mass by the further oxidation of the dioxide. At ordinary pressure in an atmosphere of oxygen it melts between 600° and 650° C. to a dark brown liquid, but in vacuum decomposes at a lower temperature. Its heat of formation from the elements is 137.6 Cal.

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