It has very few applications. Thulium does not offer a free trial. It is somewhat resistant to corrosion in dry air. This trivalent ion most commonly forms green compounds. See additional pricing details below. Thulium – Properties Thulium pricing starts at $26.38 per month, per user. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds; because it occurs so late in the series, however, the +2 oxidation state is also stabilized by the nearly full 4f shell that results. This isotope is used in X-ray machine. Our goal is to envision what’s next, rather than what’s new, and … Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. (scheikunde), (element) scheikundig element met symbool Tm en atoomnummer 69. ; Er zijn aanwijzingen dat thulium kan worden gebruikt in magnetische keramische materialen. : modern Latin, from Latin Thule (a country described by the ancient Greek explorer Pytheas), from Greek Thoulē , of unknown origin. Comprehensive information for the element Thulium - Tm is provided by this page including scores of properties, element names in many languages, most known nuclides and … Thulium is the least abundant of the naturally occurring rare earth elements. Lanthaniden ook wel bekend als zeldzame aardmetalen, verwijst een nu verouderde term voor deze elementen met vele gedeelde chemische en fysische eigenschappen. 32 radioactive isotopes of thulium have been produced, with atomic masses ranging from 146 to 177. Thulium kan worden gebruikt om lasers te maken, maar door de hoge kosten van dit metaal zijn de toepassingsmogelijkheden gering. thulium - Zelfstandignaamwoord 1. Het is een zilverwit lanthanide. What is Thulium. This lesson explains the properties and uses of this element. Word Origin late 19th cent. Thulium’s focus is B2B and Enterprise. Thulium is a soft silver-white metal. The following uses for thulium are gathered from a number of sources as well as from anecdotal comments. De ouderdom en herkomst van onze woorden en betekenissen, 2e druk, Amsterdam / Antwerpen: Veen, 2002; op website dbnl.org; ISBN 90 204 2045 3 Name: Thulium Symbol: Tm Atomic Number: 69 Atomic Mass: 168.9342 amu Melting Point: 1545.0 °C (1818.15 K, 2813.0 °F) Boiling Point: 1727.0 °C (2000.15 K, 3140.6 °F) Number of Protons/Electrons: 69 Number of Neutrons: 100 Classification: Rare Earth Crystal Structure: Hexagonal Density @ 293 K: 9.321 g/cm 3 Color: silverish Atomic Structure Abundance and Isotopes. == Ontdekking == In 1879 is thulium ontdekt door de Zweedse chemicus Per Teodor Cleve tijdens het bestuderen van onzuiverheden in lanthanideoxiden. Thulium is a chemical element with the symbol Tm and atomic number 69. It currently has no commercial applications, although one of its isotopes, thulium-169, could be used as a radiation source for portable X-ray machines. Thulium is also used in alloys with other rare earth metals. Abundance earth’s crust: 0.5 parts per million by weight, 50 parts per billion by moles Thulium is vooral gevaarlijk in de werkomgeving, omdat de dampen en gassen met de lucht ingeademd kunnen worden. About Thulium. The ground state electronic configuration of neutral thulium is [Xe].4f 13.6s 2 and the term symbol of thulium is 2 F 7/2.. Thulium: description Your user agent does not support the HTML5 Audio element. It is fairly soft and slowly tarnishes in air. Thulium meestal bestaat uit driewaardige toestand Tm3+. Thulium was discovered in 1879 by P. T. Cleve. Thulium is used in euro banknotes for its blue fluorescence under UV light to defeat counterfeiters. Thulium (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, holmium, and samarium According to Righter's proposal, elements such as tin, zinc, indium, cadmium and thulium may be found in lower concentrations on the mantle of the Moon since they never re-condensed following the impact. Thulium was discovered by Swedish chemist Per Teodor Cleve in 1879 when he was looking for impurities in samples of rare earth oxides. Het is een zilverwit lanthanide Woordherkomst Romeinse naam verwijzend naar een mytisch land in het verre noorden, vermoedelijk "Scandinavië". Thulium is the second least abundant of the lanthanides (promethium is only found in trace quantities on Earth). 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