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Astatine
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| At | 85 | 210 | 302 °C | 337 °C | Solid | 7 g/cm3 | Semi-Metal  |
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|
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| General |
| Name, Symbol, Number |
astatine, At, 85 |
| Chemical series |
halogens |
| Group, Period, Block |
17, 6, p |
| Appearance |
metallic (presumed) |
| Standard atomic weight |
(210) g·mol−1 |
| Electron configuration |
[Xe] 4f14 5d10 6s2 6p5 |
| Electrons per shell |
2, 8, 18, 32, 18, 7 |
| Physical properties |
| Phase |
solid |
| Melting point |
575 K
(302 °C, 576 °F) |
| Boiling point |
? 610 K
(? 337 °C, ? 639 °F) |
| Heat of vaporization |
ca. 40 kJ·mol−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
361 |
392 |
429 |
475 |
531 |
607 |
|
| Atomic properties |
| Crystal structure |
no data |
| Oxidation states |
±1, 3, 5, 7 |
| Electronegativity |
2.2 (scale Pauling) |
| Ionization energies |
1st: 890±40 kJ/mol |
| Miscellaneous |
| Magnetic ordering |
no data |
| Thermal conductivity |
(300 K) 1.7 W·m−1·K−1 |
| CAS registry number |
7440-68-8 |
| Selected isotopes |
|
|
| References |
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Astatine Compounds
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Source: Wikipedia article Astatine
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Chemistry Quick Facts