- ChemicalElements.com: Neptunium - http://www.chemicalelements.com/elements/np.html
- Basic information, atomic structure, and isotopes table.
- It's Elemental: Neptunium - http://education.jlab.org/itselemental/ele093.html
- Basic physical and historical information.
- Visual Elements: Neptunium - http://www.chemsoc.org/viselements/pages/neptunium.html
- General and physical information, source, and key isotopes.
- EnvironmentalChemistry.com: Neptunium - http://environmentalchemistry.com/yogi/periodic/np.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Neptunium - http://www.lenntech.com/periodic-chart-elements/np-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Neptunium - http://en.wikipedia.org/wiki/neptunium
- Notable characteristics, history, occurrence, isotopes, and weapons applications.
- LANL: Neptunium - http://periodic.lanl.gov/elements/93.html
- Basic information and history.
- ChemGlobe: Neptunium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/93.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Neptunium - http://www.webelements.com/webelements/elements/text/np/key.html
- Extensive information on history, uses, compounds, and properties.
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