Terbium

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Terbium, TUR bee uhm (chemical symbol, Tb), is a chemical element and one of the rare-earth metals. Terbium resembles silver in appearance. Many terbium compounds glow with a green color and are used in phosphors, dots on television picture tubes.

Cerium

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… See more »

Promethium

Promethium, pruh MEE thee uhm (chemical symbol Pm), is a chemical element and one of the rare-earth metals. It does not occur naturally on Earth,… See more »

Erbium

Erbium, UR bee uhm (chemical symbol, Er), is one of the rare earth metals. Its atomic number (number of protons in its nucleus) is 68. It has a… See more »

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Terbium

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