Rubidium oxide - wikipedia Rubidium oxide Rubidium oxide Names IUPAC name Rubidium oxide Other names Rubidium ( I ) oxide Dirubidium oxide Identifiers CAS Number 18088 - 11 - 4 ECHA InfoCard 100.038. 161 Properties Chemical formula Rb O Molar mass 186.94 g / moL Appearance Yellow solid Density 4 g / cm Melting point > 500 ° C Solubility in water Reacts violently to give RbOH Magnetic susceptibility ( χ ) + 1527.0 10 cm / mol Structure Crystal structure Antifluorite ( cubic ), cF12 Space group Fm3m, No. 225 Coordination geometry Tetrahedral ( Rb ) ; cubic ( O ) Hazards Main hazards Corrosive, reacts violently with water NFPA 704 0 Flash point Non-flammable Related compounds Other cations Lithium oxide Sodium oxide Potassium oxide Caesium oxide Related rubidium oxides Rubidium suboxide Rubidium peroxide Rubidium superoxide Related compounds Rubidium hydroxide Except where otherwise noted, data are given for materials in their standard state ( at 25 ° C ( 77 ° F ), 100 kPa ). Y verify ( what is ? ) Infobox references Rubidium oxide is the chemical compound with the formula Rb O. Rubidium oxide is highly reactive towards water, and therefore it would not be expected to occur naturally. The rubidium content in minerals is often calculated and quoted in terms of Rb O. In reality, the rubidium is typically present as a component of ( actually, an impurity in ) silicate or aluminosilicate. A major source of rubidium is lepidolite, KLi Al ( Al, Si ) O ( F, OH ), wherein Rb sometimes replaces K. Rb O is a yellow colored solid. The related species Na O, K O, and Cs O are colorless, pale - yellow, and orange, respectively. The alkali metal oxides M O ( M = Li, Na, K, Rb ) crystallise in the antifluorite structure. In the antifluorite motif the positions of the anions and cations are reversed relative to their positions in CaF, with rubidium ions 8 coordinate ( cubic ) and oxide ions 4 coordinate ( tetrahedral ). Contents 1 Properties 2 Synthesis 3 References 4 Further reading Properties Like other alkali metal oxides, Rb O is a strong base. Thus, Rb O reacts exothermically with water to form rubidium hydroxide. Rb O + H O → 2 RbOH So reactive is Rb O toward water that it is considered hygroscopic. Upon heating, Rb O reacts with hydrogen to rubidium hydroxide and rubidium hydride : Rb O + H → RbOH + RbH Synthesis For laboratory use, RbOH is usually used in place of the oxide. RbOH can be purchased for ca. US $ 5 / g ( 2006 ). The hydroxide is more useful, less reactive toward atmospheric moisture, and less expensive than the oxide. As for most alkali metal oxides, the best synthesis of Rb O does not entail oxidation of the metal but reduction of the anhydrous nitrate : 10 Rb + 2 RbNO → 6 Rb O + N Typical for alkali metal hydroxides, RbOH can not be dehydrated to the oxide. Instead, the hydroxide can be decomposed to the oxide ( by reduction of the hydrogen ion ) using Rb metal : 2 Rb + 2 RbOH → 2 Rb O + H Metallic Rb reacts with O, as indicated by its tendency to rapidly tarnish in air. The tarnishing process is relatively colorful as it proceeds via bronze - colored Rb O and copper - colored Rb O. The suboxides of rubidium that have been characterized by X-ray crystallography include Rb O and Rb O, as well as the mixed Cs - Rb suboxides Cs O Rb ( n = 1, 2, 3 ). The final product of oxygenation of Rb is principally RbO, rubidium superoxide : Rb + O → RbO This superoxide can then be reduced to Rb O using excess rubidium metal : 3 Rb + RbO → 2 Rb O References Jump up ^ Wells, Alexander Frank ( 1984 ). Structural Inorganic Chemistry ( 5th ed. ). Oxford : Clarendon Press. ISBN 978 - 0 - 19 - 855370 - 0. Jump up ^ Nechamkin, Howard ( 1968 ). The chemistry of the elements. New York : McGraw - Hill. p. 34. Jump up ^ Holleman, A.F. ; Wiberg, E., eds. ( 2001 ). Inorganic Chemistry. San Diego : Academic Press. ISBN 978 - 0 - 12 - 352651 - 9. Jump up ^ Holleman, A.F. ; Wiberg, E., eds. ( 2001 ). Inorganic Chemistry. San Diego : Academic Press. ISBN 978 - 0 - 12 - 352651 - 9. Jump up ^ Simon, A. ( 1997 ). `` Group 1 and 2 suboxides and subnitrides -- Metals with atomic size holes and tunnels ''. Coordination Chemistry Reviews. 163 : 253 -- 270. doi : 10.1016 / S0010 - 8545 ( 97 ) 00013 - 1. Further reading `` Rubidium Oxide ''. DiracDelta.co.uk science and engineering encyclopedia. Dirac Delta Consultants. Archived from the original on 11 December 2011. Retrieved 16 November 2011. `` Rubidium compounds : dirubidium oxide ''. WebElements : the periodic table on the web. WebElements. Retrieved 16 November 2011. `` Rubidium Oxide ''. fishersci.com. Thermo Fisher Scientific. Archived from the original on 18 April 2012. Retrieved 16 November 2011. Wikimedia Commons has media related to Rubidium oxide. Rubidium compounds RbAg I RbBr RbCl RbClO RbF RbH RbHSO RbI RbN RbNO RbOH Rb CO Rb O Rb Te Oxides Mixed oxidation states Antimony tetroxide ( Sb O ) Cobalt ( II, III ) oxide ( Co O ) Europium ( II, III ) oxide ( Eu O ) Iron ( II, III ) oxide ( Fe O ) Lead ( II, IV ) oxide ( Pb O ) Manganese ( II, III ) oxide ( Mn O ) Silver ( I, III ) oxide ( Ag O ) Triuranium octoxide ( U O ) Carbon suboxide ( C O ) Mellitic anhydride ( C O ) Praseodymium ( III, IV ) oxide ( Pr O ) Terbium ( III, IV ) oxide ( Tb O ) + 1 oxidation state Copper ( I ) oxide ( Cu O ) Dicarbon monoxide ( C O ) Dichlorine monoxide ( Cl O ) Gallium ( I ) oxide ( Ga O ) Lithium oxide ( Li O ) Potassium oxide ( K O ) Rubidium oxide ( Rb O ) Silver oxide ( Ag O ) Thallium ( I ) oxide ( Tl O ) Sodium oxide ( Na O ) Water ( hydrogen oxide ) ( H O ) + 2 oxidation state Aluminium ( II ) oxide ( Al O ) Barium oxide ( Ba O ) Beryllium oxide ( Be O ) Cadmium oxide ( Cd O ) Calcium oxide ( Ca O ) Carbon monoxide ( CO ) Chromium ( II ) oxide ( Cr O ) Cobalt ( II ) oxide ( Co O ) Copper ( II ) oxide ( Cu O ) Europium ( II ) oxide ( Eu O ) Germanium monoxide ( Ge O ) ) Iron ( II ) oxide ( Fe O ) Lead ( II ) oxide ( Pb O ) Magnesium oxide ( Mg O ) Manganese ( II ) oxide ( Mn O ) Mercury ( II ) oxide ( Hg O ) Nickel ( II ) oxide ( Ni O ) Nitric oxide ( N O ) Palladium ( II ) oxide ( Pd O ) Silicon monoxide ( Si O ) Strontium oxide ( Sr O ) Sulfur monoxide ( S O ) Disulfur dioxide ( S O ) Thorium monoxide ( Th O ) Tin ( II ) oxide ( Sn O ) Titanium ( II ) oxide ( Ti O ) Vanadium ( II ) oxide ( V O ) Zinc oxide ( Zn O ) + 3 oxidation state Aluminium oxide ( Al O ) Antimony trioxide ( Sb O ) Arsenic trioxide ( As O ) Bismuth ( III ) oxide ( Bi O ) Boron trioxide ( B O ) Cerium ( III ) oxide ( Ce O ) Dibromine trioxide ( Br O ) Chromium ( III ) oxide ( Cr O ) Dinitrogen trioxide ( N O ) Dysprosium ( III ) oxide ( Dy O ) Erbium ( III ) oxide ( Er O ) Europium ( III ) oxide ( Eu O ) Gadolinium ( III ) oxide ( Gd O ) Gallium ( III ) oxide ( Ga O ) Holmium ( III ) oxide ( Ho O ) Indium ( III ) oxide ( In O ) Iron ( III ) oxide ( Fe O ) Lanthanum oxide ( La O ) Lutetium ( III ) oxide ( Lu O ) Manganese ( III ) oxide ( Mn O ) Neodymium ( III ) oxide ( Nd O ) Nickel ( III ) oxide ( Ni O ) Phosphorus trioxide ( P O ) Praseodymium ( III ) oxide ( Pr O ) Promethium ( III ) oxide ( Pm O ) Rhodium ( III ) oxide ( Rh O ) Samarium ( III ) oxide ( Sm O ) Scandium oxide ( Sc O ) Terbium ( III ) oxide ( Tb O ) Thallium ( III ) oxide ( Tl O ) Thulium ( III ) oxide ( Tm O ) Titanium ( III ) oxide ( Ti O ) Tungsten ( III ) oxide ( W O ) Vanadium ( III ) oxide ( V O ) Ytterbium ( III ) oxide ( Yb O ) Yttrium ( III ) oxide ( Y O ) + 4 oxidation state Americium dioxide ( Am O ) Carbon dioxide ( C O ) Carbon trioxide ( C O ) Cerium ( IV ) oxide ( Ce O ) Chlorine dioxide ( Cl O ) Chromium ( IV ) oxide ( Cr O ) Dinitrogen tetroxide ( N O ) Germanium dioxide ( Ge O ) Hafnium ( IV ) oxide ( Hf O ) Lead dioxide ( Pb O ) Manganese dioxide ( Mn O ) Neptunium ( IV ) oxide ( Np O ) Nitrogen dioxide ( N O ) Osmium dioxide ( Os O ) Plutonium ( IV ) oxide ( Pu O ) Praseodymium ( IV ) oxide ( Pr O ) Protactinium ( IV ) oxide ( Pa O ) Rhodium ( IV ) oxide ( Rh O ) Ruthenium ( IV ) oxide ( Ru O ) Selenium dioxide ( Se O ) Silicon dioxide ( Si O ) Sulfur dioxide ( S O ) Tellurium dioxide ( Te O ) Terbium ( IV ) oxide ( Tb O ) Thorium dioxide ( Th O ) Tin dioxide ( Sn O ) Titanium dioxide ( Ti O ) Tungsten ( IV ) oxide ( W O ) Uranium dioxide ( U O ) Vanadium ( IV ) oxide ( V O ) Zirconium dioxide ( Zr O ) + 5 oxidation state Antimony pentoxide ( Sb O ) Arsenic pentoxide ( As O ) Dinitrogen pentoxide ( N O ) Niobium pentoxide ( Nb O ) Phosphorus pentoxide ( P O ) Protactinium ( V ) oxide ( Pa O ) Tantalum pentoxide ( Ta O ) Vanadium ( V ) oxide ( V O ) + 6 oxidation state Chromium trioxide ( Cr O ) Molybdenum trioxide ( Mo O ) Rhenium trioxide ( Re O ) Selenium trioxide ( Se O ) Sulfur trioxide ( S O ) Tellurium trioxide ( Te O ) Tungsten trioxide ( W O ) Uranium trioxide ( U O ) Xenon trioxide ( Xe O ) Iridium trioxide ( Ir O ) + 7 oxidation state Dichlorine heptoxide ( Cl O ) Manganese heptoxide ( Mn O ) Rhenium ( VII ) oxide ( Re O ) Technetium ( VII ) oxide ( Tc O ) + 8 oxidation state Osmium tetroxide ( Os O ) Ruthenium tetroxide ( Ru O ) Xenon tetroxide ( Xe O ) Iridium tetroxide ( Ir O ) Hassium tetroxide ( Hs O ) Related Oxocarbon Suboxide Oxyanion Ozonide Peroxide Superoxide Oxides are sorted by oxidation state. Category : Oxides Retrieved from `` https://en.wikipedia.org/w/index.php?title=Rubidium_oxide&oldid=852493793 '' Categories : Rubidium compounds Bases ( chemistry ) Oxides Hidden categories : Chemicals without a PubChem CID Articles without InChI source Chemical pages without ChemSpiderID Articles without EBI source Articles without KEGG source Articles without UNII source ECHA InfoCard ID from Wikidata Articles containing unverified chemical infoboxes Talk Contents About Wikipedia تۆرکجه Čeština Deutsch Español فارسی हिन्दी Bahasa Indonesia Magyar 日本 語 Português Română Русский Simple English Українська Tiếng Việt 中文 7 more Edit links This page was last edited on 29 July 2018, at 10 : 42 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. 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Question: predominant product when rb is allowed to react with o2
Answer: principally RbO2, rubidium superoxide