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| | Actinides - Elements, Chemistry, Science 1
 ChemGlobe: NeptuniumChemGlobe: Neptunium
 Electronic, thermal, and steric data along with an isotope table.
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ChemicalElements.com: NeptuniumChemicalElements.com: Neptunium
 Basic information, atomic structure, and isotopes table.
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EnvironmentalChemistry.com: NeptuniumEnvironmentalChemistry.com: Neptunium
 Atomic structure, chemical and physical properties, and table of nuclides.
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It's Elemental: NeptuniumIt's Elemental: Neptunium
 Basic physical and historical information.
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LANL: NeptuniumLANL: Neptunium
 Basic information and history.
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Lenntech: NeptuniumLenntech: Neptunium
 Physical data, chemical properties, health and environmental effects.
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Visual Elements: NeptuniumVisual Elements: Neptunium
 General and physical information, source, and key isotopes.
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WebElements: NeptuniumWebElements: Neptunium
 Extensive information on history, uses, compounds, and properties.
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Wikipedia: NeptuniumWikipedia: Neptunium
 Notable characteristics, history, occurrence, isotopes, and weapons applications.
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