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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).
Rhenium was the last element to be discovered having a stable isotope. The existence of a yet undiscovered element at this position in the periodic table had been predicted by Henry Moseley in 1914. In 1925 they reported that they detected the element in platinum ore and in the mineral columbite. They also found rhenium in gadolinite and ...
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]
Shinall Mountain is a peak in Pulaski County, Arkansas, located in the foothills of the Ouachita Mountains on the western edge of Little Rock, the capital and most populous city of Arkansas. At an elevation of 1,056 feet (322 m) above mean sea level , it is the highest natural point in Pulaski County.
In Arkansas, the aluminum hydroxides in bauxite form small oolites and pea-sized pisolites and outcrop or are located very close to the surface under thin sediments. The resource was first mined in 1898, 11 years after the State Geologist, John Branner, identified it in a sample from Pulaski County, Arkansas .
The flora and fauna of the ridge seem more closely related to the Tennessee hills to the east than to the Ozark Mountains to the west. This unique habitat has been protected by the establishment of several state and city parks, the St. Francis National Forest, recreational lakes, and in 1997 a national scenic byway, the Crowley's Ridge Parkway.
The Felsenthal National Wildlife Refuge (NWR) is a 76,000 acre (307.56 km 2) national wildlife refuge located in south-central Arkansas in Ashley, Bradley, and Union counties. Felsenthal NWR is one of three refuges forming an administrative complex, which also includes Pond Creek NWR to the northwest and Overflow NWR to the east. [2]
The following are tallies of current listings in Arkansas on the National Register of Historic Places. These counts are based on entries in the National Register Information Database as of April 24, 2008 [2] and new weekly listings posted since then on the National Register of Historic Places web site. [3]