Press question mark to learn the rest of the keyboard shortcuts. It is a chemical element with symbol Cs and its atomic number 55 atomic weight 132.905 melting point 28.5☌ boiling point 690☌ specific gravity 1.87 valence 1. It is liquid at room temperature and is the most reactive of all metals. Results are used to estimate the atom density shift in a caesium fountain clock.īayesian inference of a negative quantity from positive measurement results How does Caesium 'know' that its period of radiation is directly related with the earths rotation around the sun Or am I missing something here Press J to jump to the feed. Caesium is a soft, ductile, silvery-white element of the alkali group. Ī Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model Tests of relativity using a microwave resonatorįigure 16.9: Comparison of mW and ΓW measured at LEP-2 and pp colliders, of sin2 θW measured by NuTeV and of APV in caesium with the Standard Model prediction as a function of mH.
5 The atomic masses of these isotopes range from 112 to 151. 137 Cs (half-life equal to 30.1 years) is used in treatment of certain malignancies. The cryogenic sapphire oscillator (CSO) is compared to a commercial (Datum Inc.) active hydrogen maser whose frequency is also regularly compared to caesium and rubidium atomic fountain clocks in the laboratory. Isotopes of caesium - Wikipedia Isotopes of caesium Caesium ( 55 Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. caesium: 1 n a soft silver-white ductile metallic element (liquid at normal temperatures) the most electropositive and alkaline metal Synonyms: Cs, atomic number 55, cesium Types: cesium 137 a radioactive isotope of cesium used in radiation therapy Type of: metal, metallic element any of several chemical elements that are usually shiny. 132.90543 a member of the alkali metal group. Two-band second moment model and an interatomic potential for caesium Extension of the formalism to transition metals is straightforward, and the caesium parametrisation gives a surprisingly good description across the group.
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