| 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: Data tables and historic information. |
| 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. |
Classical
