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=__Cesium__= =History= It was discovered by German Chemists Robert Wilhelm Bunsen and Gustav Robert Kirchoff in Durkheim, Germany. Today it is often found in North America, Italy, and Kazakhstan, and Sweden. Cesium is also found in Madagascar and the Urals however, it is not found by itself it is found in different elements. =Physical Properies= It has a yellow/silvery color, boils at 978 Kelvin(671 degrees Celsius) and freezes at 25 degrees Celsius. It looks almost crystal-like and melts in your hand if you hold for just a minute and turns into a really pretty liquid gold. Cesium is usually a solid at earth temperature and it is very rare. It is an alkali metal. =Modern day uses= Production of glass, brachytherapy to treat certain types of cancer, found in photoelectric cells and some optical instruments. =Other facts= The price for pure Cesium is usually areound $100 per gram. It has 39 isotopes, one of the most of any element, and has 11 that are radioactive. =Did you Know?= Cesium is usually called Caesium. It is only called Cesium in the United States. media type="custom" key="2681805"

Bibliography: __Print Sources__ Newton, David. Chemical Elements. N.p.: n.p., 1999. __Online Sources__ "Cesium." Environmental Science Division. Aug. 2005. 15 Nov. 2008 . "Cesium." General Chemistry. 8 Nov. 2008 . "The Element: Cesium." Book Rags. 8 Nov. 2008 . Franco, David. "Cesium." Periodic Table. 10 July 2003. 8 Nov. 2008 . Gagnon, Steve. "It's Elemental-Cesium." Jefferson Lab. 8 Nov. 2008 . "How Much is Cesium Worth?" Wiki Answers. 15 Nov. 2008 .