Elements Francium
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ChemGlobe: Francium - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Francium - Basic information, atomic structure, and isotopes table.
EnvironmentalChemistry.com: Francium - Atomic structure, chemical and physical properties, and table of nuclides.
Francium - Isotopes, natural occurrence, separation, analytical properties, applications, and bibliography.
Francium Spectroscopy - Research group at the State University of New York at Stony Brook. History, facts, trapping information, and production.
It's Elemental: Francium - Basic physical and historical information.
LANL: Francium - Basic information and history.
Lenntech: Francium - Physical data and chemical properties.
Visual Elements: Francium - Image, general and physical information, and key isotopes.
WebElements: Francium - Extensive information on history and properties.
Wikipedia: Francium - Properties of the element, including its history and characteristics. Help build the largest human-edited directory on the web.