Science: Chemistry: Elements: Neptunium

See also:

Britannica Nobel Prize: Neptunium
Overview and basic data.

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.

Neptunium
Data tables and historic information.

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.

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