» Britannica Nobel Prize: Neptunium - Overview and basic data.
» ChemGlobe: Neptunium - Electronic, thermal, and steric data along with an isotope table.
» ChemicalElements.com: Neptunium - Basic information, atomic structure, and isotopes table.
» EnvironmentalChemistry.com: Neptunium - Atomic structure, chemical and physical properties, and table of nuclides.
» It's Elemental: Neptunium - Basic physical and historical information.
» LANL: Neptunium - Basic information and history.
» Lenntech: Neptunium - Physical data, chemical properties, health and environmental effects.
» Neptunium - Data tables and historic information.
» Visual Elements: Neptunium - General and physical information, source, and key isotopes.
» WebElements: Neptunium - Extensive information on history, uses, compounds, and properties.
» Wikipedia: Neptunium - Notable characteristics, history, occurrence, isotopes, and weapons applications.
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