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| | Actinides - Elements, Chemistry, Science 2
 ChemGlobe: ActiniumChemGlobe: Actinium
 Electronic, thermal, and steric data along with an isotope table.
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ChemicalElements.com: ActiniumChemicalElements.com: Actinium
 Basic information, atomic structure, and isotopes.
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EnvironmentalChemistry.com: ActiniumEnvironmentalChemistry.com: Actinium
 Atomic structure, properties, and table of nuclides.
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It's Elemental: ActiniumIt's Elemental: Actinium
 Basic physical and historical information.
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LANL: ActinumLANL: Actinum
 Basic information and history.
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Lenntech: ActiniumLenntech: Actinium
 Physical data, chemical properties, health and environmental effects.
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Visual Elements: ActiniumVisual Elements: Actinium
 Image, sources, biological role, key isotopes, and oxidation states.
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WebElements: ActiniumWebElements: Actinium
 Extensive information on history, uses, occurrence, compounds, and properties.
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Wikipedia: ActiniumWikipedia: Actinium
 Details the properties of the element, including its history, applications, and characteristics.
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