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Chemical element: Astatine (At)
| Atomic Number: | 85 |
| Element Symbol: | At |
| Element Name: | Astatine |
| Atomic Weight: | 210 |
| Group Number: | 17 |
| Group Name: | Halogen |
| Period Number: | 6 |
| Block: | p-block |
| Ground State Configuration: | [Xe] 4f14 5d10 6s2 6p5 |
| Ground State Level: | 2Po3/2 |
| Standard State: | Solid |
| Common Valences: | 1,3,5,7 |
| Atomic Radius Calculated: | 127 |
| Electron Affinity: | 270.1 |
| First Ionization Energy: | 920 |
| Pauling Electronegativity: | 2.2 |
| Allred Rochow Electronegativity: | 1.90 |
| Mulliken Jaffe Electronegativity: | 2.85 |
| Melting Point: | 302 |
| Thermal Conductivity: | 2 |
| Enthalpy Of Fusion: | about 6 (per mol At atoms) |
| Enthalpy Of Vaporization: | about 40 |
| Most Common Oxidation Numbers: | 1,-1 |
| Color: | Metallic |
| Classification: | Semi-metallic |
| Discovered By: | Dale Corson, MacKenzie, Segre |
| Discovered At: | California, USA |
| Discovered When: | 1940 |
| Origin Of Name: | From the Greek word astatos meaning unstable |
Calculate the molecular weight of Astatine or molecular weight At.
Also see the full list of chemical elements and atomic weights.
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