- WebElements: Astatine
Includes essential information, background, uses, compounds, electronic properties, and much more.
www.webelements.com/webelements/elements/text/At/key.html
- EnvironmentalChemistry.com: Astatine
Features an overview, name in other languages, atomic structure, chemical properties, physical properties, and regulatory information.
environmentalchemistry.com/yogi/periodic/At.html
- Wikipedia: Astatine
Hyperlinked overview of the element featuring notable characteristics, history, occurrence, isotopes, and more.
en.wikipedia.org/wiki/Astatine
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