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terbium |
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terbiumSoft, silver-grey, metallic element of the lanthanide series, atomic number 65, relative atomic mass 158.925. It occurs in gadolinite and other ores, with yttrium and ytterbium, and is used in lasers, semiconductors, and television tubes. It was named in 1843 by Swedish chemist Carl Mosander (1797-1858) after the town of Ytterby, Sweden, where it was first found. |
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