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