Science: Chemistry: Elements: Actinium

See also:

Actinium
Data tables and historic information.

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 charateristics.

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