| 85 |
At | Astatine
|
| Atomic Weight: 209.9871 | Shells: 2,8,18,32,18,7
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| Group: Halogen | Filling orbital: 6p5
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| Crystal Structure: ? | Covalent radius: 1.45 Ĺ
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| Oxidation States: (±1),3,5,7 | Atomic radius: 1.43 Ĺ
|
| Electronegativity, Pauling: 1.96 | Atomic volume: ?
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| State at RT: Solid | First ionization potential: 9.5 V
|
| Melting Point: 575°K | 2nd ionization potential: ?
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| Boiling Point: 610°K | 3rd ionization potential: ?
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| Density @ 293°K: ? | Specific heat: ?
|
| Electrical conductivity: -- | Heat of vaporization: ?
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| Thermal conductivity: 0.500 W/cmK | Heat of fusion: ?
|
|
|
| Element Nuclides
|
| Nuclide | Abundance | Weight | Spin | Half-Life | Decay Modes
|
| At206 | 0.% | 206. | 5 | 29.4m |  ,  +, 
|
| At208 | 0.% | 208. | 6 | 1.63h | , +,
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| At211 | 0.% | 210.9875 | 4.5 | 7.21h | ,
|
| At215 | 0.% | 214.9986 | 4.5 | 0.10ms |
|
| At217 | 0.% | 217.0047 | 4.5 | 32ms | , -
|
| At218 | 0.% | 218.0087 | 0 | 1.6s |
|
| At219 | 0.% | 219.0113 | 0 | 50s | , -
|