Caesium
alternative label: Cs
broader: Chemical entity
definition: [Wikipedia] Caesium (IUPAC spelling[6]) (also spelled cesium in American English)[note 1] is a chemical element with the 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), which makes it one of only five elemental metals that are liquid at or near room temperature.[note 2] Caesium has physical and chemical properties similar to those of rubidium and potassium. The most reactive of all metals, it is pyrophoric and reacts with water even at −116 °C (−177 °F). It is the least electronegative element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, a fission product, are extracted from waste produced by nuclear reactors.
created: 2022-02-07T17:00:00
in scheme: ozcar-theia
type: Entity
type: Concept

Chemical entity
type: Concept
narrower: Caesium