Lenntech: Praseodymium - http://www.lenntech.com/Periodic-chart-elements/Pr-en.htm
Physical data, chemical properties, health and environmental effects. |
Visual Elements: Praseodymium - http://www.chemsoc.org/viselements/pages/praseodymium.html
Image, source, uses, physical information, and key isotopes. |
WebElements: Praseodymium - http://www.webelements.com/webelements/elements/text/Pr/key.html
Extensive information on history, uses, occurrence, compounds, and properties. |
Wikipedia: Praseodymium - http://en.wikipedia.org/wiki/Praseodymium
Properties of the element, including its history, applications, and characteristics. |