Astat
Astat (Symbol At) ass e cheemescht Element mat der Uerdnungszuel 85 am Periodesystem vun den Elementer. Déi relativ Atommass vu sengem stabilsten Isotop ass 21…
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| Astat | |
|---|---|
| (fr) astate | |
 Positioun vum Astat am Periodesystem | |
| Allgemenges | |
| Symbol | At |
| Uerdnungszuel | 85 |
| Virgänger |
Polonium  |
| Nofollger |
Radon |
| Elementkategorie | Hallefmetaller, Halogeenen |
| Gehéiert zu |
6. Period vum Periodesystem, Halogeen |
| CAS-Nummer | 7440-68-8 |
| Atomar | |
| Atommass | 209,9871479 |
| Elektronekonfiguratioun | [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p⁵ |
| Physikalesch | |
| Schmëlzpunkt | 575,0 K |
| Kachpunkt | 503 K |
| Cheemesch | |
| Aner Informatiounen | |
| Entdecker | Emilio Gino Segrè |
| Datum | 1940 |
| Elektronecouche | |
 Elektronekonfiguratioun vum Astat | |
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Astat (Symbol At) ass e cheemescht Element mat der Uerdnungszuel 85 am Periodesystem vun den Elementer. Déi relativ Atommass vu sengem stabilsten Isotop ass 210.
Astat ass dat raarst natierlecht Element op der Äerd a muss – wann néideg – kënschtlech produzéiert ginn.
Um Spaweck
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Commons: Astat – Biller, Videoen an Audiodateien |
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