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- Promethium abstract "Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements. Promethium shows only one stable oxidation state of +3; however, a few +2 compounds may exist.In 1902, Bohuslav Brauner suggested there was an element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley who, having measured the atomic numbers of all the elements then known, found there was no element with atomic number 61. In 1926, an Italian and an American group claimed to have isolated a sample of element 61; both "discoveries" were soon proven to be false. In 1938, during a nuclear experiment conducted at Ohio State University, a few radioactive nuclides were produced that certainly were not radioisotopes of neodymium or samarium, but there was a lack of chemical proof that element 61 was produced, and the discovery was not generally recognized. Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor. The discoverers proposed the name "prometheum" (the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize "both the daring and the possible misuse of mankind's intellect." However, a sample of the metal was made only in 1963.There are two possible sources for natural promethium: rare decays of natural europium-151 (producing promethium-147), and uranium (various isotopes). Practical applications exist only for chemical compounds of promethium-147, which are used in luminous paint, atomic batteries and thickness measurement devices, even though promethium-145 is the most stable promethium isotope. Because natural promethium is exceedingly scarce, it is typically synthesized by bombarding uranium-235 (enriched uranium) with thermal neutrons to produce promethium-147.".
- Promethium thumbnail 61_Pm_02_large.jpg?width=300.
- Promethium wikiPageExternalLink ele061.html.
- Promethium wikiPageID "23321".
- Promethium wikiPageRevisionID "605569812".
- Promethium hasPhotoCollection Promethium.
- Promethium subject Category:Chemical_elements.
- Promethium subject Category:Lanthanides.
- Promethium subject Category:Promethium.
- Promethium subject Category:Synthetic_elements.
- Promethium comment "Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements.".
- Promethium label "Promet".
- Promethium label "Promethium".
- Promethium label "Promethium".
- Promethium label "Promethium".
- Promethium label "Prometio".
- Promethium label "Promezio".
- Promethium label "Promécio".
- Promethium label "Prométhium".
- Promethium label "Прометий".
- Promethium label "بروميثيوم".
- Promethium label "プロメチウム".
- Promethium label "钷".
- Promethium sameAs Promethium.
- Promethium sameAs Promethium.
- Promethium sameAs Προμήθειο.
- Promethium sameAs Prometio.
- Promethium sameAs Prometio.
- Promethium sameAs Prométhium.
- Promethium sameAs Prometium.
- Promethium sameAs Promezio.
- Promethium sameAs プロメチウム.
- Promethium sameAs 프로메튬.
- Promethium sameAs Promethium.
- Promethium sameAs Promet.
- Promethium sameAs Promécio.
- Promethium sameAs m.025s7xn.
- Promethium sameAs Q1809.
- Promethium sameAs Q1809.
- Promethium wasDerivedFrom Promethium?oldid=605569812.
- Promethium depiction 61_Pm_02_large.jpg.
- Promethium isPrimaryTopicOf Promethium.
