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