Cerium

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Cerium, SIHR ee uhm, is a soft, gray metal of the rare-earth group of chemical elements. Cerium was discovered in 1803 by the Swedish chemist Jons Berzelius and the Swedish geologist Wilhelm von Hisinger, and independently by the German chemist Martin Klaproth. It is named for Ceres, which is a large asteroid and a dwarf planet.

Samarium

Samarium, suh MAR ee uhm (chemical symbol, Sm), is a chemical element and one of the rare-earth metals. Alloys of samarium and cobalt are excellent… See more »

Ytterbium

Ytterbium, ih TUR bee uhm, is a soft silvery metal. Small amounts of ytterbium are used in metallurgical and chemical experiments. In 1878, the… See more »

Europium

Europium, yu ROH pee uhm (chemical symbol, Eu), is one of the rare-earth metals. It is soft and silver in color. Europium's atomic number (number… See more »

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Cerium

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