Thulium is a chemical element with the symbol Tm and atomic number 69. It is the thirteenth and third-last element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds; however, the +2 oxidation state can also be stable. In … See more Physical properties Pure thulium metal has a bright, silvery luster, which tarnishes on exposure to air. The metal can be cut with a knife, as it has a Mohs hardness of 2 to 3; it is malleable and ductile. Thulium is See more Thulium was discovered by Swedish chemist Per Teodor Cleve in 1879 by looking for impurities in the oxides of other rare earth elements (this was the same method Carl Gustaf Mosander earlier used to discover some other rare earth elements). Cleve … See more Lasers Holmium-chromium-thulium triple-doped yttrium aluminum garnet (Ho:Cr:Tm:YAG, or Ho,Cr,Tm:YAG) is an active laser medium material with high efficiency. It lases at 2080 nm in the Infra-Red and is widely used in … See more • Category:Thulium compounds See more The element is never found in nature in pure form, but it is found in small quantities in minerals with other rare earths. Thulium is often … See more Thulium is principally extracted from monazite ores (~0.007% thulium) found in river sands, through ion exchange. Newer ion-exchange and solvent-extraction techniques have … See more Soluble thulium salts are mildly toxic, but insoluble thulium salts are completely nontoxic. When injected, thulium can cause degeneration of the liver and spleen and can also cause See more WebThulium (pronounced as Thoo-lee-em) [2] is a soft, silver-gray rare earth metal [3] belonging to the Lanthanides group and represented by the symbol Tm [1]. While its most abundant, naturally occurring isotope is 169 Tm, it has 34 radioactive isotopes, out of which the most stable one is 171 Tm with a half-life period of 1.92 years [4].
Thulium - chemeurope.com
WebThulium: Symbol: Tm: Atomic Number: 69: Atomic Mass: 168.934 atomic mass unit: Number of Protons: 69: ... Tm-169, is the only form that occurs naturally. Common Uses: Lasers; ... Jefferson Lab Los Alamos National Labs Web Elements Wikipedia: Thulium Atomic Structure: Elements by Name: Elements by Number: Home ... WebOther symbols that look like element symbols Ab: albite Ac: acetate (also used for the element actinium: see above) Bn: benzyl Bz: benzoyl; berzelium (an old suggested name for praseodymium ). Et: ethyl Me: methyl; any metal atom Ph: phenyl Pr: propyl (also used for the element praseodymium: see above) R: some unspecified element or radical Notes mersey regional ambulance service
Thulium - The Chemical Elements
WebThulium is a lanthanide element, it has a bright silvery-gray luster and can be cut by a knife. It is the least abundant of the rare earths and its metal is easy to work. It slowly tarnishes in air, but is more resistant to oxidation than most rare-earth elements. It also has some corrosion resistance in dry air and good ductility. WebThulium (atomic symbol: Tm, atomic number: 69) is a Block F, Group 3, Period 6 element with an atomic weight of 168.93421. The number of electrons in each of Thulium's shells is [2, 8, 18, 31, 8, 2] and its … how strict is spirit on checked bag size