Dating obninsk Sex voice chatting live online free

Its density is about 70% higher than that of lead, and slightly lower than that of 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. Many contemporary uses of uranium exploit its unique nuclear properties.As little as 15 lb (7 kg) of uranium-235 can be used to make an atomic bomb.The first nuclear bomb used in war, Little Boy, relied on uranium fission, but the very first nuclear explosive (the Gadget used at Trinity) and the bomb that destroyed Nagasaki (Fat Man) were both plutonium bombs.

dating obninsk-86

Another fissile isotope, uranium-233, can be produced from natural thorium and is also important in nuclear technology.A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years.The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the recently-discovered planet Uranus.Eugène-Melchior Péligot was the first person to isolate the metal and its radioactive properties were discovered in 1896 by Henri Becquerel.

Leave a Reply