Look up: Uranium

1. 
   Uranium
   235 Uranium 235 is a radioactive element; over time, it gradually changes into the element lead. It can be used to date very old rock layers.
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2. 
   Uranium
   Uranium is a silvery, heavy radioactive, polyvalent metallic element that is found especially in pitchblende and uraninite and exists naturally as a mixture of three radioactive isotopes of mass number 234, 235 and 238 in the proportions of .006%, .71% and 99.28% respectively. It has the symbol U.
   Found on http://www.encyclo.co.uk/nol.php
   
   
3. 
   Uranium
   Uranium is a heavy, metallic, naturally Radioactive Element of Atomic Number 92. It has two principle isotope of uranium-235 and uranium-238 ( and very small quantities of Uranium-234). The proportions of natural uranium by weight are about 0.01% Uranium-234, 0.072% Uranium-235, and 99.27% U-238. Uranium-235 is used in the the nuclear industry because it is Fissionable by Thermal Neutrons. Natural uranium is extracted from uranium ore where it starts life as a processed uranium oxide (Yellow Cake ).
   Found on http://www.ionactive.co.uk/glossary_atoz
   
   
4. 
   uranium
   [n] - a heavy toxic silvery-white radioactive metallic element
   Found on http://www.webdictionary.co.uk/definitio
   
   
5. 
   Uranium
   Although uranium is the longest known member of the actinide group of metals, it attracted scant attention until the discovery of uranium fission in 1939. It is now of vital importance as a nuclear fuel. Uranium occurs naturally as two main isotopes, ²³⁸U (99.3%) and ²³⁵U (0.7%), along with a trace of a third isotope, ^{233...
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6. 
   Uranium
   Naturally occurring radioactive metal. Exposure to uranium is a very rare cause of lung cancer.
   Found on http://www.cancerhelp.org.uk/glossary.as
   
   
7. 
   Uranium
   Uranium is a toxic radioactive element, used in weapons of mass destruction such as dirty bombs or nuclear weapons.
   Found on http://www.army-technology.com/glossary/
   
   
8. 
   Uranium
   A mildly radioactive element with two isotopes which are fissile (U-235 and U-233) and two which are fertile (U-238 and U-234). Uranium is the basic raw material of nuclear energy.
   Found on http://www.theiet.org/factfiles/energy/n
   
   
9. 
   Uranium
   Uranium: A metallic element that is used as nuclear fuel and is highly toxic and radioactive. Exposure to radiation from uranium can occur in various ways. The breakdown of uranium products creates radon daughters. These can attach to dust particles and, if workers inhale the dust, the particles lodge in their lungs, where they release high doses o ...
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10. 
    uranium
    chemical element: atomic number 92 Category: Chemistry
    Found on http://www.mijnwoordenboek.nl/definition
    
    
11. 
    Uranium
    A radioactive element, found in ores, of which atoms can be split to create energy.
    Found on http://www.neo.ne.gov/statshtml/glossary
    
    
12. 
    uranium
    <element>A radioactive metallic element whose isotope, uranium-235, is a nuclear fission fuel. Plutonium, another fission fuel, can be produced from the more plentiful isotope uranium-238. ... (09 Oct 1997) ...
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13. 
    uranium
    U noun a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
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14. 
    uranium
    (U) (u-ra´ne-әm) a hard and heavy radioactive metallic element; atomic number, 92; atomic weight, 238.03; see Appencix 6. Naturally occurring uranium is composed of three isotopes of mass numbers 234, 235, and 238. Uranium 235 separated from U 238 undergoes fission with slow neutrons, giving...
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15. 
    Uranium
    • An element of the chromium group, found in certain rare minerals, as pitchblende, uranite, etc., and reduced as a heavy, hard, nickel-white metal which is quite permanent. Its yellow oxide is used to impart to glass a delicate greenish-yellow tint which is accompanied by a strong fluorescence, and its black oxide is used as a pigment in p...
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16. 
    uranium
    radioactive chemical element of the actinoid series of the periodic table, atomic number 92. It is an important nuclear fuel.[26 related articles]
    Found on http://www.britannica.com/eb/a-z/u/16
    
    
17. 
    uranium
    A radioactive metallic element, atomic no. 92, atomic wt. 238.0289, occurring mainly in pitchblende and notable for its two isotopes: 238U and 235U (99.2745% and 0.720%, respectively, the rest being made up by 234U), 235U being the first substance ever shown capable of supporting a self-sustaining chain reaction. [G. myth. character, Uranus]
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18. 
    Uranium
    A mildly radioactive element with two isotopes which are fissile (U-235 and U-233) and two which are fertile (U-238 and U-234). Uranium is the basic raw material of nuclear energy.
    Found on http://www.sea-us.org.au/glossary.html
    
    
19. 
    uranium
    (U) A billet of highly enriched uranium recovered from scrap processed at the Y-12 Facility in Oak Ridge, TN. Credit: US Dept of Energy A heavy, silvery-white, metallic element, radioactive, easily oxidized, and having 14 known isotopes of which ^{238
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20. 
    uranium
    A heavy, silvery-white, naturally radioactive, metallic element (atomic number 92). Its two principally occurring isotopes are uranium-235 and uranium-238. Uranium-235 is indispensable to the nuclear industry because it is the only isotope existing in nature to any appreciable extent that is fission...
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21. 
    uranium
    uranium (yOOrā'nēum) , radioactive metallic chemical element; symbol U; at. no. 92; at. wt. 238.0289; m.p. 1,132°C; b.p. 3,818°C; sp. gr. 19.1 at 25°C; valence +3, +4, +5, or +6.Sections in this article:IntroductionPropertiesIsotopes and Radioactive DecayNatural Occurrenc...
    Found on http://www.infoplease.com/ce6/sci/A08501