- EnvironmentalChemistry.com: Actinium
Offers an overview, name in other languages, atomic structure, chemical properties, physical properties, and regulation information.
environmentalchemistry.com/yogi/periodic/Ac.html
- Chemical Elements.com: Actinium
Contains basic information, atomic structure, and isotopes.
www.chemicalelements.com/elements/ac.html
- Wikipedia: Actinium
Hyperlinked overview of the element discussing notable characteristics, applications, history, occurrence, isotopes, precautions, and more.
en.wikipedia.org/wiki/Actinium
- Actinium
Includes data tables and history of the chemical element.
www.scescape.net/~woods/elements/actinium.html
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