neptunium definition

  • noun:
    • A silvery, metallic, naturally radioactive element, atomic quantity 93, the first of transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million many years. Found in trace amounts in uranium ores, it's created synthetically by nuclear reactions. See Table at element.
    • The transuranic substance element with atomic number 93 and logo Np.
    • A radioactive metallic part of atomic number 93, manufactured in atomic reactors from Plutonium or Uranium. Expression Np; The atomic fat of the very most steady isotope is 237.0482.
    • In chem., a supposed brand new element launched by Hermann in 1877 as within columbite and ferro-ilmenite. Its existence will not be confirmed.
    • a radioactive transuranic metallic element; present trace quantities in uranium ores; a by-product of production of plutonium

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