- Visual Elements: Francium - http://www.chemsoc.org/viselements/pages/francium.html
- Image, general and physical information, and key isotopes.
- ChemicalElements.com: Francium - http://www.chemicalelements.com/elements/fr.html
- Basic information, atomic structure, and isotopes table.
- It's Elemental: Francium - http://education.jlab.org/itselemental/ele087.html
- Basic physical and historical information.
- Francium - http://www.geocities.com/andyscouse/pages/francium.htm
- Isotopes, natural occurrence, separation, analytical properties, applications, and bibliography.
- EnvironmentalChemistry.com: Francium - http://environmentalchemistry.com/yogi/periodic/fr.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Francium - http://www.lenntech.com/periodic-chart-elements/fr-en.htm
- Physical data and chemical properties.
- Wikipedia: Francium - http://en.wikipedia.org/wiki/francium
- Properties of the element, including its history and characteristics.
- LANL: Francium - http://periodic.lanl.gov/elements/87.html
- Basic information and history.
- ChemGlobe: Francium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/87.html
- Electronic, thermal, and steric data along with an isotope table.
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