Cerium is in the sixth period of the periodic table. It's 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. It's also a solid.
Cerium was discovered in 1803 by Swedish chemist Jons Berzelius and geoligist Whilhelm Von Hi
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