Uranium is a chemical element with symbol U and atomic number 92. Let us know if you have suggestions to improve this article (requires login). Uranium atoms have 92 electrons and the shell structure is 2.8.18.32.21.9.2. provides eligible reporters with free access to embargoed and breaking news releases. The colour of the UO2+ ion is unknown because it undergoes disproportionation (UO2+ is simultaneously reduced to U4+ and oxidized to UO22+) even in very dilute solutions. Periodic Table of the Elements. The longest lived isotope, 223 Fr, a daughter of 227 Ac, has a half-life of 22 minutes. 2. Articles from Britannica Encyclopedias for elementary and high school students. It is ductile, malleable, and capable of taking a high polish. Unfortunately, I don't have one: This sample is only a practice round that contains no actual depleted uranium. In this quiz you’ll be shown all 118 chemical symbols, and you’ll need to choose the name of the chemical element that each one represents. 235 U belongs to primordial nuclides, because its half-life is comparable to the age of the Earth (~4.5×10 9 years). The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers. The equation for calculating nuclear charge is Zeff = Z - S, where Zeff is the effective nuclear charge, Z is the number of protons, and S is the number of inner electrons. Sniff. Uranium-238, however, after absorbing neutrons and undergoing negative beta decay, is transmuted into the synthetic element plutonium, which is fissile with slow neutrons. Uranium is a chemical element with the symbol U and atomic number 92. It is an important nuclear fuel. Density of Neptunium. Does hydrogen have more electrons than Uranium? Uranium is used in making counter-weights for aircraft control surfaces. There are 146 neutrons in the most abundant isotope. The most common isotopes in natural uranium are uranium-238 (which has 146 neutronsand accounts for over 99% of uraniu… What is Uranium? 10. Characteristics and Properties View Nuclear Periodic Table View Isotopic & Isomeric Data . 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; the half-lives of its naturally occurring isotopes range between 159,200 years and 4.5 billion years. But uranium doesn't deserve it's image as one of the periodic table's nasties. Mendeleev intended the table to illustrate recurring ("periodic") trends in the properties of the elements. One pound of uranium yields as much energy as 1.4 million kilograms (3 million pounds) of coal. Uranium is used as fuel in nuclear power plants. Periodic Table. Uranium is also important as the primary material from which the synthetic transuranium elements have been prepared by transmutation reactions. The periodic table ionic charge can be broken down by metals that are positive and on the left of the table and nonmetals which are negative and found on the right. Each entry has a full citation identifying its source. Yellow glass with 1% uranium oxide was found in an ancient Roman villa near Naples, Italy. In an aqueous solution uranium is most stable as the uranyl ion, which has a linear structure [O=U=O]2+. Uranium is the rarest metal of the chromium group. Log in, This site uses cookies to improve your experience. Named after the planet Uranus. The Periodic Table and Transuranium Elements The periodic table of elements represents a collaborative effort that crosses centuries and continents. HyperPhysics: R Nave: Go Back: Uranium. 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