Cerium is in the sixth period of the periodic table. Itís atomic number is fifty-eight, which means it has fifty-eight protons and electrons. It has an atomic mass of 140.12, giving it eighty-two neutrons. Cerium is a soft, iron gray metal of the rare earth group of chemical elements, also called the lanthanide series. Itís also a solid.
Cerium was discovered in 1803 by Swedish chemist Jons Berzelius and geoligist Whilhelm Von Hisinger, and
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added to alloys to make them stronger and is used in self-cleaning ovens, and other heat resistant alloys. It has a melting point of 1463 degrees farenheight, and a boiling point of 5894.6 degrees farenheight. It is a metal that may ignite if scratched with a file. The metal readily oxidizes in moist air at room temperature. Cerium compounds may be observed with the emission spectrometer. It has a cubic crystal structure. Cerium has six energy levels.