- It's Elemental: Astatine - http://education.jlab.org/itselemental/ele085.html
- Basic physical and historical information.
- Chemical Elements.com: Astatine - http://www.chemicalelements.com/elements/at.html
- Basic information, atomic structure, and table of isotopes.
- Visual Elements: Astatine - http://www.chemsoc.org/viselements/pages/astatine.html
- General and physical information, source, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Astatine - http://environmentalchemistry.com/yogi/periodic/at.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Astatine - http://www.lenntech.com/periodic-chart-elements/at-en.htm
- Physical data, chemical properties, and health effects.
- Wikipedia: Astatine - http://en.wikipedia.org/wiki/astatine
- Properties of the element, including its history, applications, and characteristics.
- LANL: Astatine - http://periodic.lanl.gov/elements/85.html
- History, uses, production, and properties.
- ChemGlobe: Astatine - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/85.html
- Electronic, thermal, and steric data, along with a table of isotopes.
- WebElements: Astatine - http://www.webelements.com/webelements/elements/text/at/key.html
- Extensive information on history and properties.
- Radiochemistry of Astatine - http://library.lanl.gov/cgi-bin/getfile?rc000018.pdf
- Full text of the monograph by Evan H. Appelman (Argonne National Laboratory, Lemont, Illinois).
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