- Visual Elements: Actinium - http://www.chemsoc.org/viselements/pages/actinium.html
- Image, sources, biological role, key isotopes, and oxidation states.
- It's Elemental: Actinium - http://education.jlab.org/itselemental/ele089.html
- Basic physical and historical information.
- EnvironmentalChemistry.com: Actinium - http://environmentalchemistry.com/yogi/periodic/ac.html
- Atomic structure, properties, and table of nuclides.
- ChemicalElements.com: Actinium - http://www.chemicalelements.com/elements/ac.html
- Basic information, atomic structure, and isotopes.
- Lenntech: Actinium - http://www.lenntech.com/periodic-chart-elements/ac-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Actinium - http://en.wikipedia.org/wiki/actinium
- Details the properties of the element, including its history, applications, and characteristics.
- LANL: Actinum - http://periodic.lanl.gov/elements/89.html
- Basic information and history.
- ChemGlobe: Actinium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/89.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Actinium - http://www.webelements.com/webelements/elements/text/ac/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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