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See also:
| » 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. |
| » 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. |