| Astatine | |
| Electrons per shell | 2,8,18,32,18,7 |
| Electron Configuration | [Xe] 4f14 5d10 6s2 6p5 |
| Ground state | 2P°3/2 |
| Atomic Volume | cm3 mol-1 |
| Electronegativity | 2.2 |
| Magnetic ordering | No data |
 Thermal Properties |
|
| Enthalpy of Atomization | 92 kJ mol-1 @25°C |
| Enthalpy of Fusion | 23.8 kJ mol-1 |
| Enthalpy of Vaporisation | No data. |
| Heat Capacity | No data. |
| Thermal Conductivity | 1.7 W m-1 K-1 |
| Thermal Expansion | No data. |
| Electrical Properties |
|
| Electrical resistivity | No data. |
| Electrical conductivity | ? 106/cm Ω |
| Chemical Properties |
|
| Electrochemical Equivalent | 7.8346 g Ah-1 |
| Ionization Potential | |
 First
|
9.65 |
| Energy Levels |
|
| Kα1 (intensity 0) |
81.52 KeV |
| Kα2 (intensity 50) |
78.95 KeV |
| Kβ1 (intensity 0) |
92.3 KeV |
| Lα1 (intensity 100) |
11.4268 KeV |
| Lα2 (intensity 10) |
11.3048 KeV |
| Lβ1 (intensity 38) |
13.876 KeV |
| Lβ3 (intensity 2) |
14.0678 KeV |
| Lβ4 (intensity 2) |
13.4839 KeV |
| Lγ1 (intensity 8) |
16.251 KeV |
| Lγ2 (intensity 2.7) |
16.5769 KeV |
| Lγ3 (intensity 2) |
12.47 KeV |
| Ll (intensity 6) |
9.8964 KeV |
| Atomic Radii |
|
| Empirical
|
No data. |
| Bohr Radius
|
No data. |
| Covalent Radius
|
No data. |
| Van der Waals
|
No data. |
| Triple covalent
|
138 pm |
| Metallic
|
No data. |
| Oxidation States |
|
| Main
|
At-1, At+1, At+3 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
930 |
| M+ - M2+ |
1600 |
| M2+ - M3+ |
2900 |
| M3+ - M4+ |
4000 |
| M4+ - M5+ |
4900 |
| M5+ - M6+ |
7500 |
| M6+ - M7+ |
8800 |
| M7+ - M8+ |
13300 |
| M8+ - M9+ |
15400 |
| M9+ - M10+ |
17700 |
| Covalent Bonds (kJ mol-1) |
|
| At-At
|
110 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 361 | 392 | 429 | 475 | 531 | 607 |