Web Directory

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

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

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

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

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

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

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

» WebElements: Protactinium
   Extensive information on history, uses, occurrence, compounds, and properties.
   http://www.webelements.com/protactinium/