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EnvironmentalChemistry.com: Neptunium
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Neptunium
Extensive information on history, uses, compounds, and properties.
It's Elemental: Neptunium
Basic physical and historical information.
Lenntech: Neptunium
Physical data, chemical properties, health and environmental effects.
Britannica Nobel Prize: Neptunium
Overview and basic data.
Neptunium
Data tables and historic information.
ChemicalElements.com: Neptunium
Basic information, atomic structure, and isotopes table.
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