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astatine
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A labeled diagram of the periodic table entry for astatine shows its atomic number 85, symbol At, atomic weight 210, electron configuration, and that it is a solid halogen at 20 degrees Celsius. Radioactive decay of At-211 Explore an interactive periodic table of the elements
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astatine: Media

chemical element
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astatine
Properties of astatine.
Encyclopædia Britannica, Inc.
Radioactive decay of At-211
Decay scheme showing that astatine-211 releases one alpha particle per decay.
Encyclopædia Britannica, Inc.

Interactives

Explore an interactive periodic table of the elements
Periodic table of the elements.
Encyclopædia Britannica, Inc.
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