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