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- Neptunium abstract "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 its 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. It occurs in three allotropic forms. The element normally exhibits five oxidation states, ranging from +3 to +7.In the 1870s, Dmitri Mendeleev first predicted the existence of neptunium, and 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. Most neptunium is produced by bombarding uranium with neutrons in nuclear reactors; neptunium is also generated as a by-product in conventional nuclear reactors. Though neptunium has no commercial uses at present, it is widely used as a precursor for the formation of plutonium-238, used in radioisotope thermal generators which are used to power some spacecraft. Neptunium itself can be used in detectors of high-energy neutrons.The most stable isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production, and it can be used as a component in neutron detection equipment. The isotopes neptunium-237 and neptunium-239 are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay.".
- Neptunium wikiPageExternalLink neptunium.html.
- Neptunium wikiPageExternalLink r?dbs+hsdb:@term+@na+@rel+neptunium,+radioactive.
- Neptunium wikiPageExternalLink neptunium.pdf.
- Neptunium wikiPageExternalLink danl-lbw060502.php.
- Neptunium wikiPageExternalLink 093.htm.
- Neptunium wikiPageID "21277".
- Neptunium wikiPageRevisionID "600560577".
- Neptunium hasPhotoCollection Neptunium.
- Neptunium subject Category:Actinides.
- Neptunium subject Category:Chemical_elements.
- Neptunium subject Category:Neptunium.
- Neptunium subject Category:Synthetic_elements.
- Neptunium comment "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 its 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. It occurs in three allotropic forms.".
- Neptunium label "Neptun (pierwiastek)".
- Neptunium label "Neptunio".
- Neptunium label "Neptunium".
- Neptunium label "Neptunium".
- Neptunium label "Neptunium".
- Neptunium label "Neptunium".
- Neptunium label "Neptúnio".
- Neptunium label "Nettunio".
- Neptunium label "Нептуний".
- Neptunium label "نبتونيوم".
- Neptunium label "ネプツニウム".
- Neptunium label "镎".
- Neptunium sameAs Neptunium.
- Neptunium sameAs Neptunium.
- Neptunium sameAs Ποσειδώνιο.
- Neptunium sameAs Neptunio.
- Neptunium sameAs Neptunio.
- Neptunium sameAs Neptunium.
- Neptunium sameAs Neptunium.
- Neptunium sameAs Nettunio.
- Neptunium sameAs ネプツニウム.
- Neptunium sameAs 넵투늄.
- Neptunium sameAs Neptunium.
- Neptunium sameAs Neptun_(pierwiastek).
- Neptunium sameAs Neptúnio.
- Neptunium sameAs m.025s4ry.
- Neptunium sameAs Q1105.
- Neptunium sameAs Q1105.
- Neptunium wasDerivedFrom Neptunium?oldid=600560577.
- Neptunium isPrimaryTopicOf Neptunium.