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neptunium    音标拼音: [nɛpt'uniəm]
n. 镎

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neptunium
n 1: a radioactive transuranic metallic element; found in trace
amounts in uranium ores; a by-product of the production of
plutonium [synonym: {neptunium}, {Np}, {atomic number 93}]

Neptunium \Nep*tu"ni*um\, n. [NL.]
A radioactive metallic element of atomic number 93, produced
in nuclear reactors from Plutonium or Uranium. Symbol Np; The
atomic weight of the most stable isotope is 237.0482.
[PJC]

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  • Neptunium - Wikipedia
    A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons Neptunium metal is silvery and tarnishes when exposed to air The element occurs in three allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7
  • Neptunium - Element information, properties and uses | Periodic Table
    Neptunium was first made in 1940 by Edwin McMillan and Philip Abelson at Berkeley, California It came from a uranium target that had been bombarded with slow neutrons and which then emitted unusual beta-rays indicating a new isotope
  • Neptunium | Radioactive, Fissionable, Transuranic | Britannica
    Neptunium (Np), radioactive chemical element of the actinoid series of the periodic table that was the first transuranium element to be artificially produced, atomic number 93
  • Neptunium Np 93 | Periodic Table of Elements | Los Alamos National . . .
    Neptunium, like most actinides, is a ductile, silvery, radioactive metal that tarnishes when exposed to air It has a low melting point Its boiling point is not empirically known but is guessed at from its vapor pressure It has the largest liquid range of any element
  • Neptunium | History, Uses, Facts, Physical Chemical Characteristics
    Neptunium, successor of uranium, was discovered in 1940 by Edwin McMillan and Philip H Abelson while they were trying to isolate fission products It is used in plutonium production which in turn has uses in military and is also used as fuel to provide electricity to space craft
  • Neptunium Element Facts - chemicool. com
    Neptunium was the first synthetic transuranium element (elements after uranium) of the actinide series to be discovered Neptunium was first produced by Edwin McMillan and Philip H Abelson in 1940 at Berkeley Radiation Laboratory of the University of California
  • Isotopes of neptunium - Wikipedia
    Neptunium (93 Np) is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given Like all trace or artificial elements, it has no stable isotopes
  • Neptunium Facts (Np or Atomic Number 93) - Science Notes and Projects
    Neptunium is a silver radioactive metal with atomic number 93 and element symbol Np While you might think it’s an exotic element that you never encounter, it actually occurs in many smoke detectors as a decay product of americium-241
  • Neptunium: Element Properties and Uses - samaterials. com
    Neptunium (Np) is a radioactive, silvery metal with an atomic number of 93 It is the first transuranic element and is primarily produced in nuclear reactors Neptunium has applications in nuclear research and can be used to produce plutonium-239 for nuclear weapons and energy
  • Neptunium: Uses, Properties and Interesting Facts
    Neptunium is a silvery metal of the actinide group of elements The radioactive decay of uranium produces neptunium as a fission product, so neptunium is usually found in trace amounts associated with uranium ores





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