It's Elemental: Protactinium
Basic physical and historical information.
EnvironmentalChemistry.com: Protactinium
Atomic structure, chemical and physical properties, and table of nuclides.
Radiochemistry of Protactinium
Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio). [PDF]
ChemGlobe: Protactinium
Electronic, thermal, and steric data along with an isotope table.
LANL: Protactinium
Basic information and history.
Britannica Nobel Prize: Protactinium
Overview and basic data.
ChemicalElements.com: Protactinium
Basic information, atomic structure, and isotopes.
Visual Elements: Protactinium
General and physical information, source, and key isotopes.
Protactinium
Data tables and historic information.
WebElements: Protactinium
Extensive information on history, uses, occurrence, compounds, and properties.
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