https://wikimd.org/index.php?action=history&feed=atom&title=RheniumRhenium - Revision history2026-04-25T05:36:41ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.org/index.php?title=Rhenium&diff=5647819&oldid=prevPrab: CSV import2024-04-22T07:37:33Z<p>CSV import</p>
<p><b>New page</b></p><div>[[File:Perrhenic-acid-3D-balls.png|Perrhenic-acid-3D-balls|thumb]] [[File:Nonahydridorhenate-3D-balls.png|Nonahydridorhenate-3D-balls|thumb|left]] [[Image:Molybdenit_1.jpg|Molybdenit 1|thumb|left]] [[Image:Ammonium_perrhenate.jpg|Ammonium perrhenate|thumb]] [[Image:Engine.f15.arp.750pix.jpg|Engine.f15.arp.750pix|thumb]] [[File:CFM56_P1220759.jpg|CFM56 P1220759|thumb]] '''Rhenium''' is a [[chemical element]] with the symbol Re and [[atomic number]] 75. It is a silvery-gray, heavy, third-row [[transition metal]] in the [[periodic table]]. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the [[Earth]]'s crust. Rhenium has the third-highest [[melting point]] and second-highest [[boiling point]] of any element at 5869 K. Rhenium resembles [[manganese]] chemically and is mainly obtained as a by-product of the extraction and refinement of [[molybdenum]] and [[copper]] ores.<br />
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==Properties==<br />
Rhenium has many unique properties that make it valuable in a variety of applications. It has an unusually high melting point, making it ideal for use in high-temperature superalloy engines for [[jet aircraft]] and industrial [[gas turbine]]s. It is also used in filaments for mass spectrometers and in electrical contacts. Its density is one of the highest among all elements, surpassed only by [[platinum]], [[iridium]], and [[osmium]].<br />
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==History==<br />
Rhenium was the last naturally occurring element to be discovered. It was identified by Masataka Ogawa in 1908 in Japan in a mineral that also contained [[niobium]] and [[tantalum]]. However, he mistakenly identified it as element 43 (later named [[technetium]]), and the discovery was corrected to rhenium in 1925 by Walter Noddack, Ida Tacke, and Otto Berg in Germany. They named it after the Rhine River.<br />
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==Occurrence==<br />
Rhenium is not found free in nature or as a compound in a distinct mineral, but is widely dispersed in small amounts in the [[Earth]]'s crust. It is mostly obtained as a by-product of the extraction of molybdenum from porphyry copper mines. Chile and the United States are significant producers of rhenium.<br />
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==Applications==<br />
Rhenium's high melting point and resistance to corrosion make it an important alloying element in superalloys that are used in high-temperature turbine engines. Alloys of rhenium with [[nickel]] and [[cobalt]] are used in jet engine parts and in gas turbines for power generation. Rhenium is also used in the production of lead-free, high-octane gasoline and in platinum-rhenium catalysts for the production of [[ethylene]] in the petrochemical industry. Additionally, rhenium is used in the medical field for the treatment of liver cancer through the use of rhenium-188 radiopharmaceuticals.<br />
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==Isotopes==<br />
Rhenium has one stable isotope, rhenium-185, and one radioactive isotope, rhenium-187, with a very long half-life. This makes rhenium unique among the elements, as it has one of the longest detectable half-lives for its radioactive isotope.<br />
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==See Also==<br />
* [[Transition metal]]<br />
* [[Periodic table]]<br />
* [[Molybdenum]]<br />
* [[Copper]]<br />
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[[Category:Chemical elements]]<br />
[[Category:Transition metals]]<br />
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