Editing Caesium (section)

====Oxides====
[[File:Cs11O3 cluster.png|thumb|left|upright=0.7|{{chem|Cs|11|O|3}} cluster|alt=The stick and ball diagram shows three regular octahedra, which are connected to the next one by one surface and the last one shares one surface with the first. All three have one edge in common. All eleven vertices are purple spheres representing caesium, and at the center of each octahedron is a small red sphere representing oxygen.]]

More so than the other alkali metals, caesium forms numerous binary compounds with [[oxygen]]. When caesium burns in air, the [[superoxide]] {{chem|CsO|2}} is the main product.<ref name="cotton">{{cite book |last=Cotton |first=F. Albert |author2=Wilkinson, G. |title=Advanced Inorganic Chemistry |date=1962 |publisher=John Wiley & Sons, Inc. |page=318 |isbn=978-0-471-84997-1}}</ref> The "normal" [[caesium oxide]] ({{chem|Cs|2|O}}) forms yellow-orange [[hexagonal crystal system|hexagonal]] crystals,<ref name="CRC">{{RubberBible87th|pages=451, 514}}</ref> and is the only oxide of the anti-[[cadmium chloride|{{chem|CdCl|2}}]] type.<ref name="ReferenceA">{{cite journal |doi=10.1021/j150537a022 |date=1956 |last1=Tsai |first1=Khi-Ruey |last2=Harris |first2=P. M. |last3=Lassettre |first3=E. N. |journal=Journal of Physical Chemistry |volume=60 |pages=338–344 |title=The Crystal Structure of Cesium Monoxide |issue=3 |url=http://www.dtic.mil/get-tr-doc/pdf?AD=AD0026963 |url-status=dead |archive-url=https://web.archive.org/web/20170924131429/http://www.dtic.mil/get-tr-doc/pdf?AD=AD0026963 |archive-date=24 September 2017}}</ref> It vaporizes at {{convert|250|°C}}, and decomposes to caesium metal and the [[peroxide]] [[caesium peroxide|{{chem|Cs|2|O|2}}]] at temperatures above {{convert|400|°C}}. In addition to the superoxide and the [[ozonide]] [[caesium ozonide|{{chem|CsO|3}}]],<ref>{{cite journal |doi=10.1007/BF00845494 |title=Synthesis of cesium ozonide through cesium superoxide |date=1963 |last1=Vol'nov |first1=I. I. |last2=Matveev |first2=V. V. |journal=Bulletin of the Academy of Sciences, USSR Division of Chemical Science |volume=12 |pages=1040–1043 |issue=6}}</ref><ref>{{cite journal |doi=10.1070/RC1971v040n02ABEH001903 |title=Alkali and Alkaline Earth Metal Ozonides |date=1971 |last1=Tokareva |first1=S. A. |journal=Russian Chemical Reviews |volume=40 |pages=165–174 |bibcode=1971RuCRv..40..165T |issue=2 |s2cid=250883291}}</ref> several brightly coloured [[suboxide]]s have also been studied.<ref name="Simon">{{cite journal |last=Simon |first=A. |title=Group 1 and 2 Suboxides and Subnitrides — Metals with Atomic Size Holes and Tunnels |journal=Coordination Chemistry Reviews |date=1997 |volume=163 |pages=253–270 |doi=10.1016/S0010-8545(97)00013-1}}</ref> These include {{chem|Cs|7|O}}, {{chem|Cs|4|O}}, {{chem|Cs|11|O|3}}, {{chem|Cs|3|O}} (dark-green<ref>{{cite journal |doi=10.1021/j150537a023 |date=1956 |last1=Tsai |first1=Khi-Ruey |last2=Harris |first2=P. M. |last3=Lassettre |first3=E. N. |journal=Journal of Physical Chemistry |volume=60 |pages=345–347 |title=The Crystal Structure of Tricesium Monoxide |issue=3}}</ref>), CsO, {{chem|Cs|3|O|2}},<ref>{{cite journal |doi=10.1007/s11669-009-9636-5 |title=Cs-O (Cesium-Oxygen) |date=2009 |last1=Okamoto |first1=H. |journal=Journal of Phase Equilibria and Diffusion |volume=31 |pages=86–87 |s2cid=96084147}}</ref> as well as {{chem|Cs|7|O|2}}.<ref>{{cite journal |doi=10.1021/jp036432o |title=Characterization of Oxides of Cesium |date=2004 |last1=Band |first1=A. |last2=Albu-Yaron |first2=A. |last3=Livneh |first3=T. |last4=Cohen |first4=H. |last5=Feldman |first5=Y. |last6=Shimon |first6=L. |last7=Popovitz-Biro |first7=R. |last8=Lyahovitskaya |first8=V. |last9=Tenne |first9=R. |journal=The Journal of Physical Chemistry B |volume=108 |pages=12360–12367 |issue=33}}</ref><ref>{{cite journal |doi=10.1002/zaac.19472550110 |title=Untersuchungen ber das System Csium-Sauerstoff |date=1947 |last1=Brauer |first1=G. |journal=Zeitschrift für Anorganische Chemie |volume=255 |issue=1–3 |pages=101–124}}</ref> The latter may be heated in a vacuum to generate {{chem|Cs|2|O}}.<ref name="ReferenceA"/> Binary compounds with [[sulfur]], [[selenium]], and [[tellurium]] also exist.<ref name="USGS"/>