Astatine
Chemical, physical and material properties and data of the chemical element Astatine.
General Information about Astatine
Regular nameAstatineChemical symbolAtOther namesSystematic nameHistorical namesName meaning, originDiscovery (year)OccurencePosition in the PSEGroup membership
Atomar Properties of Astatine
Atomic number Z85 = number of protonsStandard Atomic Weight209.987146832
Electron configuration of Astatine
| 1s | 2s | 2p | 3s | 3p | 3d | 4s | 4p | 4d | 4f | 5s | 5p | 5d | 5f | 6s | 6p | 6d | 6f | 7s | 7p |
|---|
| 2 | 2 | 6 | 2 | 6 | 10 | 2 | 6 | 10 | 14 | 2 | 6 | 10 | | 2 | 5 | | | | |
Abbreviated form: [Xe] 4f14 5d10 6s2 6p5 .
Ionization Energies of Astatine
The following table lists the ionization energies IE (ionization potentials); the IE is the energy required in electron volts (eV) per atom to separate a given electron from an Astatine atom.
| IE1 | IE2 | IE3 | IE4 | IE5 |
|---|
| 9.31751(8) | 20 | 29 | 41 | 51 |
Isotopic Data of Astatine
An overview of the nuclides as well as the isotopic data and properties are listed on the following page: Astatine isotopes.
Chemistry of Astatine
Oxidation states- 1. + 1Electronegativity2.2 (Pauling original)
2.20 (Pauling)
2.60 (Allen)Electron affinity2.41578(7) eV
233.0865 kJ mol-1
Material and Physical Properties
Melting point302 °CEnthalpy of fusion (molar)23.8 kJ mol-1Boiling point337 °CEnthalpy of vaporization54.39 kJ mol-1Density6.35 g cm-3 (At2)
External Data, Identifiers
CAS registry number7440-68-8InChI =1S/AtInChIKeyRYXHOMYVWAEKHL-UHFFFAOYSA-NPubChem ID5460479
Last update: 2022-12-12
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