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