 |
| Name |
astatine |
| Symbol |
At |
| Atomic Weight |
209.99 |
| Atomic Number |
85 |
| CAS ID |
7440-68-8 |
| Group Number |
17 |
| Group Name |
Halogen |
| Period Number |
6 |
| Origin of Name |
Greek, astatos = "unstable." |
| Year Discovered |
1940 |
| Discovery Credits |
Produced by D. R. Corson, K. R. Mackenzie,
and E. Segre at the University of California, USA. |
| Class |
Semi-metallic |
| Color |
Metallic Grey |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Radioactive non-metallic element which does not occur
naturally. Relatively unknown because of the short half-life. |
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