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The longest-lived and most abundant (nearly 100%) naturally occurring isotope of protactinium, protactinium-231, has a half-life of 32,760 years and is a decay product of uranium-235. Much smaller trace amounts of the short-lived protactinium-234 and its nuclear isomer protactinium-234m occur in the decay chain of uranium-238 .
Protactinium-231 is the longest-lived isotope of protactinium, with a half-life of 32,760 years. In nature, it is found in trace amounts as part of the actinium series, which starts with the primordial isotope uranium-235; the equilibrium concentration in uranium ore is 46.55 231 Pa per million 235 U.
Protactinium(V) bromide has two similar monoclinic forms, one is obtained by sublimation at 400–410 °C and another by sublimation at slightly lower temperature of 390–400 °C. [5] [7] Protactinium iodides result from the oxides and aluminium iodide or ammonium iodide heated to 600 °C. [2]
Protactinyl nitrate, protactinium(V) oxynitrate, or erroneously known as protactinium nitrate, is a radioactive chemical compound with the formula PaO(NO 3) 3 ·xH 2 O (1.5 ≤ x ≤ 4). It is a white solid that readily hydrolyzes to protactinium(V) oxide in moist air. This compound is a common commercial source of protactinium. [2]
160 / 49 15 1945 A remodeling of the Edgewater was completed in 2014. The new tower's height is 160 feet. 10 The Constellation Apartments 158 [12] / 48 14 2014 Located in the rapidly growing Capitol East District. 11 The Galaxie 158 / 48 14 2016 Located in the rapidly growing Capitol East District. 12 One Hundred Wisconsin Avenue 157.07 / 47.8 ...
Madison has a mayor-council system of government. Madison's city council, known as the Common Council, consists of 20 members, one from each district. The mayor is elected in a citywide vote. Madison is the heart of Wisconsin's 2nd congressional district in the United States House of Representatives, represented by Mark Pocan (D).
Vladeck in 1924. The development is named after Baruch Charney Vladeck (1886–1938), who was general manager of The Jewish Daily Forward, a Yiddish language newspaper, helped found the Jewish Labor Committee in 1934, served as its first president, and was a member of the original board of the New York City Housing Authority.
Protactinium(IV) chloride is a chartreuse, hygroscopic, crystalline solid that can be sublimed at 400 °C in a vacuum. It is soluble in strong mineral acids , forming green solutions. The complex PaCl 4 ·4CH 3 CN is formed with acetonitrile .