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Protactinium

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ChemGlobe: Protactinium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/91.html Electronic, thermal, and steric data along with an isotope table.

ChemicalElements.com: Protactinium - http://www.chemicalelements.com/elements/pa.html Basic information, atomic structure, and isotopes.

EnvironmentalChemistry.com: Protactinium - http://environmentalchemistry.com/yogi/periodic/Pa.html Atomic structure, chemical and physical properties, and table of nuclides.

It's Elemental: Protactinium - http://education.jlab.org/itselemental/ele091.html Basic physical and historical information.

LANL: Protactinium - http://periodic.lanl.gov/elements/91.html Basic information and history.

Radiochemistry of Protactinium - http://library.lanl.gov/cgi-bin/getfile?rc000046.pdf Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio).

Visual Elements: Protactinium - http://www.chemsoc.org/viselements/pages/protactinium.html General and physical information, source, and key isotopes.

WebElements: Protactinium - http://www.webelements.com/webelements/elements/text/Pa/key.html Extensive information on history, uses, occurrence, compounds, and properties.

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