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  See also:


http://www.britannica.com/nobel/micro/420_27.html
» Britannica Nobel Prize: Neptunium - Overview and basic data.

http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/93.html
» ChemGlobe: Neptunium - Electronic, thermal, and steric data along with an isotope table.

http://www.chemicalelements.com/elements/np.html
» ChemicalElements.com: Neptunium - Basic information, atomic structure, and isotopes table.

http://environmentalchemistry.com/yogi/periodic/Np.html
» EnvironmentalChemistry.com: Neptunium - Atomic structure, chemical and physical properties, and table of nuclides.

http://education.jlab.org/itselemental/ele093.html
» It's Elemental: Neptunium - Basic physical and historical information.

http://periodic.lanl.gov/elements/93.html
» LANL: Neptunium - Basic information and history.

http://www.lenntech.com/Periodic-chart-elements/Np-en.htm
» Lenntech: Neptunium - Physical data, chemical properties, health and environmental effects.

http://www.chemsoc.org/viselements/pages/neptunium.html
» Visual Elements: Neptunium - General and physical information, source, and key isotopes.

http://www.webelements.com/webelements/elements/text/Np/key.html
» WebElements: Neptunium - Extensive information on history, uses, compounds, and properties.

http://en.wikipedia.org/wiki/Neptunium
» Wikipedia: Neptunium - Notable characteristics, history, occurrence, isotopes, and weapons applications.


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