Cerium
Links
Visual Elements: Cerium
http://www.chemsoc.org/viselements/pages/cerium.html
Image, animation, uses, general and physical information, and key isotopes.
It's Elemental: Cerium
http://education.jlab.org/itselemental/ele058.html
Basic physical and historical information.
ChemicalElements.com: Cerium
http://www.chemicalelements.com/elements/ce.html
Basic information, atomic structure, and isotopes.
Wikipedia: Cerium
http://www.wikipedia.org/wiki/Cerium
Properties of the element, including its history, applications, and charateristics.
EnvironmentalChemistry.com: Cerium
http://environmentalchemistry.com/yogi/periodic/Ce.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Cerium
http://www.webelements.com/webelements/elements/text/Ce/key.html
Extensive information on history, uses, occurrence, compounds, and properties.
Lenntech: Cerium
http://www.lenntech.com/Periodic-chart-elements/Ce-en.htm
Physical data, chemical properties, health and environmental effects.