Wectar - Science - Chemistry - Elements - Protactinium

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	ChemicalElements.com: Protactinium URL: http://www.chemicalelements.com/elements/pa.html ODP description: Basic information, atomic structure, and isotopes. Page title: Chemical Elements.com - Protactinium (Pa)
	ChemGlobe: Protactinium URL: http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/91.html ODP description: Electronic, thermal, and steric data along with an isotope table. Page title: Protactinium [Pa] [91] - Chemical element datasheet - Periodic Table of the Elements - ChemGlobe
	EnvironmentalChemistry.com: Protactinium URL: http://environmentalchemistry.com/yogi/periodic/Pa.html ODP description: Atomic structure, chemical and physical properties, and table of nuclides. Page title: Periodic Table of Elements: Protactinium â Pa (EnvironmentalChemistry.com)
	Visual Elements: Protactinium URL: http://www.chemsoc.org/viselements/pages/protactinium.html ODP description: General and physical information, source, and key isotopes. Page title: Visual Elements - Protactinium
	WebElements: Protactinium URL: http://www.webelements.com/webelements/elements/text/Pa/key.html ODP description: Extensive information on history, uses, occurrence, compounds, and properties. Page title: Chemistry : Periodic Table : protactinium : key information
	It's Elemental: Protactinium URL: http://education.jlab.org/itselemental/ele091.html ODP description: Basic physical and historical information. Page title: It's Elemental - The Element Protactinium Page description: The Element Protactinium - Basic Physical and Historical Information
	LANL: Protactinium URL: http://periodic.lanl.gov/elements/91.html ODP description: Basic information and history. Page title: Protactinium
	Radiochemistry of Protactinium URL: http://library.lanl.gov/cgi-bin/getfile?rc000046.pdf ODP description: Full text of the monograph by H. W. Kirby (Mound Laboratory, Miamisburg, Ohio).