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Europium is a chemical element; it has symbol Eu and atomic number 63. It is a silvery-white metal of the lanthanide series that reacts readily with air to form a dark oxide coating. Europium is the most chemically reactive, least dense, and softest of the lanthanides. It is soft enough to be cut with a knife.
For example, europium(III) oxide can be used in picture tube televisions [67] and europium-doped yttrium oxysulfide (Y 2 O 2 S:Eu 3+) can be used as phosphors. [68] In addition, europium compounds can also be used in the manufacture of anti-counterfeiting materials.
A well-known example of the Eu anomaly is seen on the Moon. REE analyses of the Moon's light-colored lunar highlands show a large positive Eu anomaly due to the plagioclase-rich anorthosite comprising the highlands. The darker lunar mare, consisting mainly of basalt, shows a large negative Eu anomaly. This has led geologists to speculate as to ...
Pages in category "Europium compounds" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. * Europium compounds; E.
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]
Europium(III) chloride is an inorganic compound with the formula EuCl 3. The anhydrous compound is a yellow solid. Being hygroscopic it rapidly absorbs water to form ...
A third polymorph of europium(II) iodide is formed if it is prepared from europium and ammonium iodide at low temperatures (200 K) in liquid ammonia. This low-temperature phase is orthorhombic and in space group Pnma (no. 62). This is the same structure as modification IV of strontium iodide. [6]
Europium(III) telluride is an inorganic compound, one of the tellurides of europium, with the chemical formula Eu 2 Te 3. In this compound, Eu is in the +3 oxidation state. [2] It can form cubic crystals. [3] It has limited solubility in lead telluride and forms a solid solution. [4]