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terbium

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terbium

Soft, 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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They’re generally clustered in a separate grouping at the bottom of the table, are known collectively as the lanthanoids, and these are their names, in order of atomic number (57-70): lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, and ytterbium.
A Chromium (Cr) B Polonium (Po) C Terbium (Tb) D Magnesium (Mg) 5.
Odour-maker Geza Schon explains that the sun is "predominantly composed of hydrogen and helium with a molten cocktail of copper, terbium, strontium, antimony and europium in its core".
 
 
 
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