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Britannica Nobel Prize: Neptunium
Overview and basic data. (infos)ChemicalElements.com: Neptunium
Basic information, atomic structure, and isotopes table. (infos)
It's Elemental: Neptunium
Basic physical and historical information. (infos)
Neptunium
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Visual Elements: Neptunium
General and physical information, source, and key isotopes. (infos)
EnvironmentalChemistry.com: Neptunium
Atomic structure, chemical and physical properties, and table of nuclides. (infos)
WebElements: Neptunium
Extensive information on history, uses, compounds, and properties. (infos)
Lenntech: Neptunium
Physical data, chemical properties, health and environmental effects. (infos)
Wikipedia: Neptunium
Notable characteristics, history, occurrence, isotopes, and weapons applications. (infos)
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