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uranium 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/yo͝oˈrānēəm/,
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The chemical element of atomic number 92, a gray, dense radioactive metal used as a fuel in nuclear reactors,
  1. The chemical element of atomic number 92, a gray, dense radioactive metal used as a fuel in nuclear reactors

  1. a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  2. Uranium 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. ...
  3. Uranium is an American television program about heavy metal which aired on Fuse TV (MMUSA when the program debuted) in the early 2000s. ...
  4. The element with atomic number 92 and symbol U
  5. The basic material for nuclear technology. It is a slightly radioactive naturally occurring heavy metal that is more dense than lead. Uranium is 40 times more common than silver.
  6. 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 fuel of nuclear energy.
  7. A heavy, naturally-occurring, radioactive element.
  8. naturally occurring radioactive chemical element found in the earths crust. Used as fuel at nuclear power plants. See enriched uranium.
  9. A radioactive element with the atomic number 92 and, as found in natural ores, an atomic weight of approximately 238. The two principal natural isotopes are uranium-235 (which comprises 0.7 percent of natural uranium), which is fissile, and uranium-238 (99. ...
  10. A heavy, silver-gray radioactive metal occurring in three isotopes. Its symbol is U. One isotope of uranium (U235) is used as fuel in nuclear reactors and weapons.
  11. A fairly abundant metallic element. Approximately 993 of every 1,000 uranium atoms are U^238. Almost all of the remaining atoms are U^235, which can be made to split, or fission, and generate heat energy.
  12. The heaviest element normally found in nature. The principal fuel material used in today's nuclear reactors is the fissile isotope uranium-235.
  13. This metal is one of the heaviest of all known elements. It was named after the planet Uranus. Uranium gives off radioactivity. As it loses atomic particles, it decays and ends up, after millions of years, as lead. ...
  14. Heaviest natural element, a metal. Isotopes 233 and 235 are fissile, 238 fertile. It is an alpha-emitter.
  15. yer-AYN-ee-uhm/ A weakly radioactive chemical element; atomic weight 238.02891; atomic number 92. There are three isotopes: U-238, U-235, and U-234. Uranium decays slowly by emitting an alpha particle. The half-life of U-238 is about 4. ...
  16. A chemical element, U, that has an atomic number 92. It reactive with nearly all nonmetals and is used as fuel for nuclear reactors.
  17. A silvery-gray metallic chemical element with the highest atomic weight of the naturally occurring elements, it is approximately 70% denser than lead. Uranium is weakly radioactive and occurs naturally in low concentrations (a few parts per million) in soil, rock and water. ...
  18. Uranium (symbol "U" and atomic number 92), a silvery-grey metallic substance, is the heaviest element found in nature. It is radioactive and used to fuel nuclear reactors. Ruled by Uranus, it is 40 times more common than silver, but decays over time into lead. Lead is ruled by Saturn. ...
  19. the heaviest naturally occurring (metal) element in the earth's crust, exists as three isotopes in the following percentages by weight: U-238, 99.283%; U-234, 0.711%; and U-235, 0. ...
  20. primordial radioactive element having long-lived isotopes and occurring in rocks and soils as typically a few ppm, or 5 to 50 Bq/kg. A precursor to radium, and therefore to radon.
  21. A heavy radioactive metal, used chiefly as fuel for nuclear reactors and weapons, but it also has uses in pigments. Around 1950, uranium was considered a major factor in United States power and prestige, and did not have nearly the amount of negative connotation it has today. [I, 2]
  22. Hard, grey radioactive metal.