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- Caesium abstract "Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium. The metal is extremely reactive and pyrophoric, reacting with water even at −116 °C (−177 °F). It is the least electronegative element with a 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.Two German chemists, Robert Bunsen and Gustav Kirchhoff, discovered caesium in 1860 by the newly developed method of flame spectroscopy. The first small-scale applications for caesium were as a "getter" in vacuum tubes and in photoelectric cells. In 1967, a specific frequency from the emission spectrum of caesium-133 was chosen to be used in the definition of the second by the International System of Units. Since then, caesium has been widely used in atomic clocks.Since the 1990s, the largest application of the element has been as caesium formate for drilling fluids. It has a range of applications in the production of electricity, in electronics, and in chemistry. The radioactive isotope caesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology. Although the element is only mildly toxic, it is a hazardous material as a metal and its radioisotopes present a high health risk if released into the environment.".
- Caesium thumbnail CsCrystals.JPG?width=300.
- Caesium wikiPageExternalLink 055.htm.
- Caesium wikiPageID "5879".
- Caesium wikiPageRevisionID "601185425".
- Caesium book "Alkali metals".
- Caesium book "Caesium".
- Caesium book "Chemical elements".
- Caesium book "Period 6 elements".
- Caesium caption "The fire diamond hazard sign for caesium metal".
- Caesium commons "y".
- Caesium flammability "3".
- Caesium hasPhotoCollection Caesium.
- Caesium health "4".
- Caesium portal "Chemistry".
- Caesium reactivity "3".
- Caesium s "W".
- Caesium s "y".
- Caesium sSearch "1911".
- Caesium v "y".
- Caesium vSearch "Caesium atom".
- Caesium wikt "y".
- Caesium wiktSearch "caesium".
- Caesium subject Category:Alkali_metals.
- Caesium subject Category:Caesium.
- Caesium subject Category:Chemical_elements.
- Caesium subject Category:Reducing_agents.
- Caesium comment "Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium. The metal is extremely reactive and pyrophoric, reacting with water even at −116 °C (−177 °F).".
- Caesium label "Caesium".
- Caesium label "Caesium".
- Caesium label "Cesio (elemento chimico)".
- Caesium label "Cesio".
- Caesium label "Cesium".
- Caesium label "Cez".
- Caesium label "Césio".
- Caesium label "Césium".
- Caesium label "Цезий".
- Caesium label "سيزيوم".
- Caesium label "セシウム".
- Caesium label "铯".
- Caesium sameAs Cesium.
- Caesium sameAs Caesium.
- Caesium sameAs Καίσιο.
- Caesium sameAs Cesio.
- Caesium sameAs Zesio.
- Caesium sameAs Césium.
- Caesium sameAs Sesium.
- Caesium sameAs Cesio_(elemento_chimico).
- Caesium sameAs セシウム.
- Caesium sameAs 세슘.
- Caesium sameAs Cesium.
- Caesium sameAs Cez.
- Caesium sameAs Césio.
- Caesium sameAs m.025tnb6.
- Caesium sameAs Q1108.
- Caesium sameAs Q1108.
- Caesium wasDerivedFrom Caesium?oldid=601185425.
- Caesium depiction CsCrystals.JPG.
- Caesium isPrimaryTopicOf Caesium.