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Europium is the most chemically reactive, least dense, and softest of the lanthanides. It is soft enough to be cut with a knife. Europium was discovered in 1896, provisionally designated as Σ; in 1901, it was named after the continent of Europe. [9]
Eugène-Anatole Demarçay (1 January 1852 [1] – 5 March 1903 [2]) was a French chemist who designed an apparatus to produce a spark using an induction coil and used it to generate the spectra of rare earth elements which he examined using spectroscopy, thus detecting the element europium in 1896, and isolated it as the oxide europia in 1901.
Perey discovered it as a decay product of 227 Ac. [178] Francium was the last element to be discovered in nature, rather than synthesized in the lab, although four of the "synthetic" elements that were discovered later (plutonium, neptunium, astatine, and promethium) were eventually found in trace amounts in nature as well. [179]
Europium is exempt of this classification as it has two valence states: Eu 2+ and Eu 3+. [29] Yttrium is grouped as heavy rare-earth element due to chemical similarities. [ 30 ] The break between the two groups is sometimes put elsewhere, such as between elements 63 (europium) and 64 (gadolinium). [ 31 ]
Named for the Americas, because it was discovered in the United States; by analogy with europium . The name of the continent America itself is derived from the name of the Italian navigator Amerigo Vespucci. Curium (Cm) 96 Curie, Marie and Pierre eponym Named in honour of Marie and Pierre Curie, who discovered radium and researched radioactivity.
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Tellurium-bearing compounds were first discovered in 1782 in a gold mine in Kleinschlatten ... Compounds containing promethium (Pm), europium (Eu), ytterbium ...
Handy, in an unrelated case, made headlines after federal authorities discovered fetal remains in her apartment in March 2022. She reportedly stole the remains from a medical waste truck parked ...