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Neptunium is a chemical element; it has symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar System, which uranium is named after. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons.
237 Np is the only neptunium isotope produced in significant quantity in the nuclear fuel cycle , both by successive neutron capture by uranium-235 (which fissions most but not all of the time) and uranium-236 , or (n,2n) reactions where a fast neutron occasionally knocks a neutron loose from uranium-238 or isotopes of plutonium .
The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66100 of a US survey foot, [ 1] or exactly 7.92 inches or 20.1168 cm. The unit is based on Gunter's chain, a metal chain ...
Twin-engined civil transport airliner, initial production version. Powered by new 625 hp (466 kW) P&W Wasp, on special order for Deutsche Luft Hansa in 1934. This designation was given to the first Boeing 247 aircraft, it was used to test a number improvements that were later incorporated into the Boeing 247D.
Apart from their main spectrum holdings across large regions in the country (listed below) the major US carriers (AT&T, Sprint, T-Mobile & Verizon) also hold various Cellular Market Area (CMA) and/or Economic Area (EA) licenses for the AWS 1700 band, as well as Major Trading Area (MTA) and/or Basic Trading Area (BTA) licenses for the PCS 1900 ...
The Highway 237 Bikeway is a 5-mile (8.0 km) pedestrian and bicycle path that parallels State Route 237. The majority of the path is separated from vehicular traffic, however, two sections comprising a total of 1.5 miles (2.4 km) follow an on-street alignment adjacent the freeway. This bikeway serves as an important connector in the network of ...
Isotopes of uranium. Uranium ( 92 U) is a naturally occurring radioactive element (radioelement) with no stable isotopes. It has two primordial isotopes, uranium-238 and uranium-235, that have long half-lives and are found in appreciable quantity in Earth's crust. The decay product uranium-234 is also found. Other isotopes such as uranium-233 ...
237. Year 237 ( CCXXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Perpetuus and Felix (or, less frequently, year 990 Ab urbe condita ). The denomination 237 for this year has been used since the early medieval period, when the ...