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ChemicalElements.com: Praseodymium
Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Praseodymium
Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Praseodymium
Basic physical and historical information.
LANL: Praseodymium
History, uses, production, and properties.
Lenntech: Praseodymium
Physical data, chemical properties, health and environmental effects.
Praseodymium
Data tables and historic information.
Visual Elements: Praseodymium
Image, source, uses, physical information, and key isotopes.
WebElements: Praseodymium
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Praseodymium
Properties of the element, including its history, applications, and characteristics.