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Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium). Naturally occurring rhenium is only 37.4% 185 Re, and 62.6% 187 Re, which is unstable but has a very long half-life (~10 10 years).
It is the raw material for all rhenium compounds, being the volatile fraction obtained upon roasting the host ore. [26] Rhenium, in addition to the +4 and +7 oxidation states, also forms a trioxide. It can be formed by reducing rhenium(VII) oxide with carbon monoxide at 200 C or elemental rhenium at 4000 C. [27] It can also be reduced with ...
Etzanoa is a historical city of the Wichita people, located in present-day Arkansas City, Kansas, near the Arkansas River, that flourished between 1450 and 1700. [1] Dubbed "the Great Settlement" by Spanish explorers who visited the site, Etzanoa may have housed 20,000 Wichita people. [2] The historical city is considered part of Quivira. [3]
The location of the state of Arkansas. Paleontology in Arkansas refers to paleontological research occurring within or conducted by people from the U.S. state of Arkansas. The fossil record of Arkansas spans from the Ordovician to the Eocene. [1] Nearly all of the state's fossils have come from ancient invertebrate life. [1]
Archaeologists have confirmed that an ancient grave site unearthed recently in western Norway contains the remains of wealthy Viking women buried alongside jewellery, silver coins, and other ...
An Arkansas man who picked up what he thought was a piece of glass at a state park says he later learned his jelly bean-sized find was something much more valuable: It was a 4.87-carat diamond.
“These young women discovered something that nobody else knew,” the documentary's director, David Tedeschi (who previously edited Scorsese’s Rolling Thunder Revue and George Harrison: Living ...
They named the elements rhenium in respect of Ida's birthplace, and masurium in honor of his. [7] After scientists were sceptical of their results, the Noddack's began to perform more experiments to confirm their discoveries. Only rhenium's discovery was confirmed. They were unable to isolate element 43 and their results were not reproducible. [7]