It's Elemental: Astatine
Basic physical and historical information.
Wikipedia: Astatine
Properties of the element, including its history, applications, and characteristics.
EnvironmentalChemistry.com: Astatine
Atomic structure, chemical and physical properties, and table of nuclides.
Radiochemistry of Astatine
Full text of the monograph by Evan H. Appelman (Argonne National Laboratory, Lemont, Illinois). [PDF]
ChemGlobe: Astatine
Electronic, thermal, and steric data, along with a table of isotopes.
LANL: Astatine
History, uses, production, and properties.
Britannica Nobel Prize: Astatine
Overview and basic data.
Chemical Elements.com: Astatine
Basic information, atomic structure, and table of isotopes.
Visual Elements: Astatine
General and physical information, source, key isotopes, and ionisation energies.
Lenntech: Astatine
Physical data, chemical properties, and health effects.
Astatine
Data tables and historic information.
WebElements: Astatine
Extensive information on history and properties.
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