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Britannica Nobel Prize: Neptunium

http://www.britannica.com/nobel/micro/420_27.html

Overview and basic data.

ChemicalElements.com: Neptunium

http://www.chemicalelements.com/elements/np.html

Basic information, atomic structure, and isotopes table.

EnvironmentalChemistry.com: Neptunium

http://environmentalchemistry.com/yogi/periodic/Np.html

Atomic structure, chemical and physical properties, and table of nuclides.

It's Elemental: Neptunium

http://education.jlab.org/itselemental/ele093.html

Basic physical and historical information.

LANL: Neptunium

http://periodic.lanl.gov/elements/93.html

Basic information and history.

Lenntech: Neptunium

http://www.lenntech.com/Periodic-chart-elements/Np-en.htm

Physical data, chemical properties, health and environmental effects.

http://www.scescape.net/~woods/elements/neptunium.html

Data tables and historic information.

Visual Elements: Neptunium

http://www.chemsoc.org/viselements/pages/neptunium.html

General and physical information, source, and key isotopes.

WebElements: Neptunium

http://www.webelements.com/webelements/elements/text/Np/key.html

Extensive information on history, uses, compounds, and properties.

Wikipedia: Neptunium

http://en.wikipedia.org/wiki/Neptunium

Notable characteristics, history, occurrence, isotopes, and weapons applications.