Praseodymium
Links
Visual Elements: Praseodymium
http://www.chemsoc.org/viselements/pages/praseodymium.html
Image, source, uses, physical information, and key isotopes.
It's Elemental: Praseodymium
http://education.jlab.org/itselemental/ele059.html
Basic physical and historical information.
ChemicalElements.com: Praseodymium
http://www.chemicalelements.com/elements/pr.html
Basic information, atomic structure, and isotopes.
Praseodymium
http://www.scescape.net/~woods/elements/praseodymium.html
Data tables and historic information.
EnvironmentalChemistry.com: Praseodymium
http://environmentalchemistry.com/yogi/periodic/Pr.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Praseodymium
http://www.webelements.com/webelements/elements/text/Pr/key.html
Extensive information on history, uses, occurrence, compounds, and properties.
Lenntech: Praseodymium
http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm
Physical data, chemical properties, health and environmental effects.