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  • Eudialytic metasyenite (Kipawa Syenite Complex, Mesoproterozoic, 994 Ma; near the Kipawa River, Villedieu Township, Temiscamingue County, sw Quebec, Canada) 1Cesium

    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, 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. 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.

    source:wikipedia\Image by: jsj1771

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