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A caesium atomic fountain used as part of an atomic clock. The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency.
Caesium (IUPAC spelling; [9] also spelled cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature .
Caesium peroxide or cesium peroxide is an inorganic compound of caesium and oxygen with the chemical formula Cs 2 O 2. It can be formed from caesium metal by adding a stoichiometric amount in ammonia solution, or oxidizing the solid metal directly. [1] 2 Cs + O 2 → Cs 2 O 2. It can also be formed by the thermal decomposition of caesium ...
Cs 2 O: caesium oxide: 20281-00-9 Cs 2 SO 3: caesium sulfite: Cs 2 SO 4: caesium sulfate: 10294-54-9 Cs 2 SiO 3: caesium metasilicate: 15586-77-3 Cs 2 TeO 4: caesium tellurate: 34729-54-9 Cs 2 TiO 3: caesium titanate caesium metatitanate: 12158-57-5 Cs 2 WO 4: caesium orthotungstate: 13587-19-4 Cs 2 HPO 3: dicaesium phosphite: Cs 2 HPO 4 ...
For elements that have multiple allotropes, the reference state usually is chosen to be the form in which the element is most stable under 1 bar of pressure. One exception is phosphorus, for which the most stable form at 1 bar is black phosphorus, but white phosphorus is chosen as the standard reference state for zero enthalpy of formation. [2]
Caesium hydride or cesium hydride is an inorganic compound of caesium and hydrogen with the chemical formula Cs H.It is an alkali metal hydride.It was the first substance to be created by light-induced particle formation in metal vapor, [2] and showed promise in early studies of an ion propulsion system using caesium. [3]
Caesium oxalate (standard IUPAC spelling), or dicesium oxalate, or cesium oxalate (American spelling) is a chemical compound with the chemical formula Cs 2 C 2 O 4. It is a caesium salt of oxalic acid .
Caesium carbonate or cesium carbonate is a chemical compound with the chemical formula Cs 2 C O 3. It is white crystalline solid . Caesium carbonate has a high solubility in polar solvents such as water , ethanol and DMF .