Periodic Table of the Elements: Astatine
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| 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. ..... Click the link for more information. | |
| Atomic Weight: | (210) |
| Electron Configuration: | 2 · 8 · 18 32 · 18 · 7 |