Neptunium: Difference between revisions
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==History== | ==History== | ||
Neptunium was the first synthetic [[transuranium]] element of the [[actinide]] series to be discovered. In 1940, Edwin McMillan and Philip H. Abelson produced the isotope <sup>239</sup>Np at the [[Berkeley Radiation Laboratory]] of the [[University of California, Berkeley]] by bombarding uranium with cyclotron-produced, slow moving neutrons.<ref>[http://periodic.lanl.gov/93.shtml Neptunium] From the website of the [[Los Alamos National Laboratory]] (LANL)</ref> | Neptunium was the first [[Synthetic elements|synthetic]] [[transuranium]] element of the [[actinide]] series to be discovered. In 1940, Edwin McMillan and Philip H. Abelson produced the isotope <sup>239</sup>Np at the [[Berkeley Radiation Laboratory]] of the [[University of California, Berkeley]] by bombarding uranium with cyclotron-produced, slow moving neutrons.<ref>[http://periodic.lanl.gov/93.shtml Neptunium] From the website of the [[Los Alamos National Laboratory]] (LANL)</ref> | ||
==References== | ==References== | ||
{{reflist}} | {{reflist}} | ||
Revision as of 11:16, 3 May 2011
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Neptunium is a chemical element, having the chemical symbol Np. Its atomic number (the number of protons) is 93. It has a standard atomic weight of 237.0462 g•mol −1 and it is a solid in its elemental form.
Neptunium is considered a member of the "Transuranic" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 3,900 °C and a melting point of 644 °C.
History
Neptunium was the first synthetic transuranium element of the actinide series to be discovered. In 1940, Edwin McMillan and Philip H. Abelson produced the isotope 239Np at the Berkeley Radiation Laboratory of the University of California, Berkeley by bombarding uranium with cyclotron-produced, slow moving neutrons.[1]
References
- ↑ Neptunium From the website of the Los Alamos National Laboratory (LANL)