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Автор: Jesse Russel
Год: 2012
Издание:
Книга по Требованию
Страниц: 70
ISBN: 9785510549744
High Quality Content by WIKIPEDIA articles! Uranium ( /j??re?ni?m/ yew-ray-nee-?m) is a silvery-white metallic chemical element in the actinide series of the periodic table, with atomic number 92. It is assigned the chemical symbol U. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. The uranium nucleus binds between 141 and 146 neutrons, establishing six isotopes (U-233 through U-238), the most common of which are uranium-238 (146 neutrons) and uranium-235 (143 neutrons). All isotopes are unstable and uranium is weakly radioactive. Uranium has the second highest atomic weight of the naturally occurring elements, lighter only than plutonium-244. Its density is about 70% higher than that of lead, but not as dense as gold or tungsten. It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite. Данное издание представляет собой компиляцию...
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Urania universum. Band 15