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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 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 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
  • Periodic Table of Elements: Los Alamos National Laboratory
    With the most stable isotope of neptunium, 237 Np, having a half-life of about two million years, all the neptunium present during the formation of the Earth (4 5 billion years old) has long since decayed away by now
  • Neptunium | Np (Element) - PubChem
    Chemical element, Neptunium, information from authoritative sources Look up properties, history, uses, and more
  • Neptunium study yields plutonium insights for space exploration
    Researchers at the Department of Energy’s Oak Ridge National Laboratory are breathing new life into the scientific understanding of neptunium, a unique, radioactive, metallic element — and a key precursor for production of the plutonium-238, or Pu-238, that fuels exploratory spacecraft
  • Neptunium: A Comprehensive Guide to its Properties, Uses, and Safety
    Explore the fascinating world of Neptunium, a radioactive actinide with unique properties and applications Learn about its historical background, physical and chemical properties, important chemical reactions, potential uses, and safety measures
  • What Is Neptunium Used For? Its Applications Explained
    Neptunium is a synthetic, radioactive chemical element with the symbol Np and atomic number 93 It is the first transuranic element ever discovered, synthesized in 1940 by Edwin McMillan and Philip H Abelson





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