Definitions for neptunium
nɛpˈtu ni əm, -ˈtyu-nep·tu·ni·um

Princeton's WordNetRate this definition:0.0 / 0 votes

1. neptunium, Np, atomic number 93noun

   a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

GCIDERate this definition:0.0 / 0 votes

1. Neptuniumnoun

   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.

WiktionaryRate this definition:0.0 / 0 votes

1. neptuniumnoun

   The transuranic chemical element with atomic number 93 and symbol Np.

2. Etymology: After Neptune (the planet).

WikipediaRate this definition:0.0 / 0 votes

1. Neptunium

   Neptunium is a chemical element with the symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus. 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. It is radioactive, poisonous, pyrophoric, and capable of accumulating in bones, which makes the handling of neptunium dangerous. Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. Since then, most neptunium has been and still is produced by neutron irradiation of uranium in nuclear reactors. The vast majority is generated as a by-product in conventional nuclear power reactors. While neptunium itself has no commercial uses at present, it is used as a precursor for the formation of plutonium-238, and in radioisotope thermal generators to provide electricity for spacecraft. Neptunium has also been used in detectors of high-energy neutrons. The longest-lived isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production. This isotope, and the isotope neptunium-239, are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay.

ChatGPTRate this definition:0.0 / 0 votes

1. neptunium

   Neptunium is a radioactive chemical element with the symbol Np and atomic number 93. It is silver metallic in color and is a member of the actinide series in the periodic table. It was the first transuranic element discovered and named after the planet Neptune. Neptunium naturally occurs in small amounts in Uranium ores and it is mainly produced as a byproduct from nuclear reactors during the production of Plutonium. It has a variety of isotopes, all of which are radioactive. It is used in neutron detection equipment and also in the production of Plutonium-238 for spacecraft propulsion.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Neptuniumnoun

   a new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite

2. Etymology: [NL.]

WikidataRate this definition:0.0 / 0 votes

1. Neptunium

   Neptunium is a chemical element with the symbol Np and atomic number 93. A radioactive metal, neptunium is the first transuranic element, and belongs to the actinide series. Its most stable isotope, 237Np, is a by-product of nuclear reactors and plutonium production, and it can be used as a component in neutron detection equipment. Neptunium is also found in trace amounts in uranium ores due to transmutation reactions.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Neptunium

   Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol Np, atomic number 93, and atomic weight 237.

Matched Categories

1. • Metallic Element

How to pronounce neptunium?

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Numerology

1. Chaldean Numerology

   The numerical value of neptunium in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of neptunium in Pythagorean Numerology is: 7

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=neptunium
2. ^ GCIDE
   https://gcide.gnu.org.ua/?q=neptunium
3. ^ Wiktionary
   https://en.wiktionary.org/wiki/Neptunium
4. ^ Wikipedia
   https://en.wikipedia.org/wiki/Neptunium
5. ^ ChatGPT
   https://chat.openai.com
6. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/neptunium
7. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=neptunium