ChemicalElements.com: Neptunium - Basic information, atomic structure, and isotopes table.
It's Elemental: Neptunium - Basic physical and historical information.
EnvironmentalChemistry.com: Neptunium - Atomic structure, chemical and physical properties, and table of nuclides.
Lenntech: Neptunium - Physical data, chemical properties, health and environmental effects.
Wikipedia: Neptunium - Notable characteristics, history, occurrence, isotopes, and weapons applications.
Encyclopedia Britannica: Neptunium - Overview, discovery, structure and properties.
WebElements: Neptunium - Extensive information on history, uses, compounds, and properties.
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