ChemGlobe: Promethium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/61.html
Electronic, thermal, and steric data along with an isotope table. |
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. |
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. |