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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.
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 .
226–246 E. 49th St. and 227–245 E. 48th St., New York, New York ... As of 2024, the rowhouse at 240 East 49th Street is the Consulate General of Ukraine in New ...
P. Protactinium-211; Protactinium-212; Protactinium-213; Protactinium-214; Protactinium-215; Protactinium-216; Protactinium-217; Protactinium-217m; Protactinium-218
Privately owned public spaces (POPS) in New York City were introduced in the 1961 Zoning Resolution. The city offers zoning concessions to commercial and residential developers in exchange for a variety of spaces accessible and usable for the public. There are over 590 POPS at over 380 buildings in New York City and are found principally in Manhattan. Spaces range from extended sidewalks to ...
The 49th Street Theatre (later renamed Cinema 49) was a Broadway theater at 235 West 49th Street in the Theater District of Manhattan in New York City.The 750-seat neo-Renaissance style theater was designed by the architect Herbert J. Krapp for the Shubert Organization. [1]
Yale Club of New York City {50 Vanderbilt Avenue} November 22, 2016: Penn Club of New York, formerly Yale Club of New York (30–32 West 44th Street) February 9, 2010: Minnie E. Young House (19 East 54th Street) November 22, 2016: William and Helen Martin Murphy Ziegler Jr. House (116 East 55 Street) May 1, 2001
Tower 49 is an office skyscraper in the Midtown Manhattan neighborhood of New York City. The lot has frontage on both 48th and 49th Streets between Fifth Avenue and Madison Avenue . [ 2 ] The street frontages were offset by about the width of an NYC brownstone lot on both sides.