![]() The reaction is so fast that if the reaction is carried out in a glass vessel, the glass container will shatter. The resulting solution is basic because of the dissolved hydroxide. The reaction continues even when the solution becomes basic. So, it reacts with fluorine, F 2, chlorine, Cl 2, bromine, I 2, and iodine, I 2, to form respectively caesium(I) bromide, CsF, caesium(I) chloride, CsCl, caesium(I) bromide, CsBr, and caesium(I) iodide, CsI.ĢCs(s) + I 2(g) → CsI(s) Reaction of caesium with acidsĬaesium (cesium in USA) metal dissolves readily in dilute sulphuric acid to form solutions containing the aquated Cs(I) ion together with hydrogen gas, H 2.ĢCs(s) + H 2SO 4(aq) → 2Cs +(aq) + SO 4 2-(aq) + H 2(g) Reaction of caesium with basesĬaesium (cesium in USA) metal reacts rapidly with water to form a colourless basic solution of caesium hydroxide (CsOH) and hydrogen gas (H 2). The reaction is faster than that of rubidium (immediately above caesium in the periodic table).ĢCs(s) + 2H 2O → 2CsOH(aq) + H 2(g) Reaction of caesium with the halogensĬaesium (cesium in USA) metal reacts vigorously with all the halogens to form caesium halides. Although not known for certain, the reaction is probably slower than that of francium (immediately below caesium in the periodic table). If caesium is burned in air, the result is mainly formation of orange caesium superoxide, CsO 2.Ĭs(s) + O 2(g) → CsO 2(s) Reaction of caesium with waterĬaesium (cesium in USA) metal reacts rapidly with water to form a colourless solution of caesium hydroxide (CsOH) and hydrogen gas (H 2). However, this surface soon tarnishes because of reaction with oxygen and moisture from the air. The resulting surface is bright and shiny. Caesium (cesium in USA) is very soft and easily cut.
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