Cerium

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Cerium

Cerium (pronounced: /ˈsɪəriəm/) is a chemical element with the symbol Ce and atomic number 58. It is a soft, ductile, and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Cerium is the second element in the lanthanide series, and while it often shows the +3 oxidation state characteristic of the series, it also exceptionally has a stable +4 state that does not oxidize water.

Etymology

The name Cerium is derived from the dwarf planet Ceres, which was discovered two years before the element in 1801. The element was discovered by Jöns Jakob Berzelius and Wilhelm Hisinger in Sweden, and independently by Martin Heinrich Klaproth in Germany.

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