It's Elemental: Actinium
Basic physical and historical information.
Wikipedia: Actinium
Details the properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Actinium
Atomic structure, properties, and table of nuclides.
ChemGlobe: Actinium
Electronic, thermal, and steric data along with an isotope table.
LANL: Actinum
Basic information and history.
ChemicalElements.com: Actinium
Basic information, atomic structure, and isotopes.
Visual Elements: Actinium
Image, sources, biological role, key isotopes, and oxidation states.
Lenntech: Actinium
Physical data, chemical properties, health and environmental effects.
Actinium
Data tables and historic information.
WebElements: Actinium
Extensive information on history, uses, occurrence, compounds, and properties.
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