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This is cerium.

Symbol Ce
Atomic number 58
Atomic mass 140.12 amu

Cerium was discovered in 1803.


It is the most abundant of the rare-earth elements. It occurs naturally in monazite sands. It is the key ingredient of Misch-metal alloy.

  • Chemical composition: (Ce, La, Y, Th)(PO4)
    A widely occurring mineral containing metals of the rare-earth series. Monazite is a phosphate (containing a PO43- group) of the radioactive elements, especially:


Alloys containing cerium are used to make heat-resistant jet-engine parts. Oxides of cerium are also promising candidates for new petroleum-cracking catalysts.

See also

Periodic table of the elements