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ChemicalElements.com: Promethium

http://www.chemicalelements.com/elements/pm.html

Basic information, atomic structure, and isotopes.

EnvironmentalChemistry.com: Promethium

http://environmentalchemistry.com/yogi/periodic/Pm.html

Atomic structure, chemical and physical properties, and table of nuclides.

It's Elemental: Promethium

http://education.jlab.org/itselemental/ele061.html

Basic physical and historical information.

LANL: Promethium

http://periodic.lanl.gov/elements/61.html

History, sources, uses, and properties.

Lenntech: Promethium

http://www.lenntech.com/Periodic-chart-elements/Pm-en.htm

Physical data, chemical properties, health and environmental effects.

http://www.scescape.net/~woods/elements/promethium.html

Data table and historic information.

Visual Elements: Promethium

http://www.chemsoc.org/viselements/pages/promethium.html

Image, animation, source, uses, and ionisation energies.

WebElements: Promethium

http://www.webelements.com/webelements/elements/text/Pm/key.html

Extensive information on history, uses, occurrence, compounds, and properties.

Wikipedia: Promethium

http://en.wikipedia.org/wiki/Promethium

Properties of the element, including its history, applications, and characteristics.