Periodic Table of the Elements: Astatine

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Periodic Table of the Elements: Astatine
Atomic Number:85
Atomic Symbol:At
 Astatineastatine
[Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302°C; (estimated); b.p. 337°C; (estimated); density unknown; valence believed to be +1, +3, +5, or +7.
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Atomic Weight:(210)
Electron Configuration:2 · 8 · 18 32 · 18 · 7
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