Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table.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. Uranium–lead dating, abbreviated U–Pb dating, is one of the oldest and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range.. The dating method is usually performed on the mineral zircon.. Uranium-235 is a naturally occurring isotope of Uranium metal.It is the only fissile Uranium isotope being able to sustain nuclear fission. Uranium-235 is the only fissile radioactive isotope which is a primordial nuclide existing in the nature in its present form since before the creation of Earth. In dating: Fission-track dating …during the spontaneous fission of uranium-238. In this unique type of radioactive decay, the nucleus of a single parent uranium atom splits into two fragments of similar mass with such force that a trail of crystal damage is left in the mineral. Uranium: Uranium (U), radioactive chemical element of the actinoid series of the periodic table, atomic number 92. It is an important nuclear fuel. Uranium constitutes about two parts per million of Earth’s crust. Some important uranium minerals are pitchblende (impure U3O8), uraninite (UO2), carnotite (a Uranium is a naturally occurring element that can be found in low levels within all rock, soil, and water. Uranium is also the highest-numbered element to be found naturally in significant quantities on earth and is always found combined with other elements. It, along with all elements with atomic weights higher than iron, are only naturally formed in supernova explosions. Uran (benannt nach dem Planeten Uranus) ist ein chemisches Element mit dem Elementsymbol U und der Ordnungszahl 92. Im Periodensystem steht es in der Gruppe der Actinoide (7. Periode, f-Block).Uran ist ein Metall, dessen sämtliche Isotope radioaktiv sind. Natürlich in Mineralen auftretendes Uran besteht zu etwa 99,3 % aus dem Isotop 238 U und zu 0,7 % aus 235 U. To fully understand Gentry's hypothesis a basic background in geology, mineralogy, and radiation physics is helpful. The boxes on the next few pages present a brief tutorial in rocks, minerals, and radioactivity. The various dating techniques available to archaeologists by Michael G. Lamoureux, March/April 2009 Introduction. Today's archaeologist has a wide variety of natural, electro-magnetic, chemical, and radio-metric dating methodologies available to her that can be used to accurately date objects that are just a few hundred years old as well as objects that are a few million years old with high. Evidence of Ancient Atomic Knowledge?.PAGE 2 . Scientists Discover Six Ancient Zones of Depleted Uranium with Plutonium Products . Here at s8int.com, we smell a rat.