Science: Chemistry: Elements: Neptunium
Britannica Nobel Prize: Neptunium
Overview and basic data.
Electronic, thermal, and steric data along with an isotope table.
Basic information, atomic structure, and isotopes table.
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Neptunium
Basic physical and historical information.
Basic information and history.
Physical data, chemical properties, health and environmental effects.
Data tables and historic information.
Visual Elements: Neptunium
General and physical information, source, and key isotopes.
Extensive information on history, uses, compounds, and properties.
Notable characteristics, history, occurrence, isotopes, and weapons applications.
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