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Astatine, 85At| Astatine |
|---|
| Pronunciation | (AS-tə-teen, -tin) |
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| Appearance | unkent, but probably metallic |
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| Mass number | [210] |
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| Astatine in the periodic cairt |
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|
|
| Atomic nummer (Z) | 85 |
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| Group | group 17 (halogens) |
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| Period | period 6 |
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| Block | p-block |
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| Element category | Metalloid |
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| Electron confeeguration | [Xe] 4f14 5d10 6s2 6p5 |
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| Electrons per shell | 2, 8, 18, 32, 18, 7 |
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| Pheesical properties |
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| Phase at STP | solit |
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| Meltin pynt | 575 K (302 °C, 576 °F) |
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| Bylin pynt | 610 K (337 °C, 639 °F) |
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| Density (near r.t.) | (At2) 6.2–6.5 (predictit)[1] g/cm3 |
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| Heat o vapourisation | (At2) 54.39 kJ/mol |
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Vapour pressur
| P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
| at T (K)
|
361
|
392
|
429
|
475
|
531
|
607
|
|
| Atomic properties |
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| Oxidation states | −1, +1, +3, +5, +7[2] |
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| Electronegativity | Pauling scale: 2.2 |
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| Covalent radius | 150 pm |
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| Van der Waals radius | 202 pm |
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| Ither properties |
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| Thermal conductivity | 1.7 W/(m·K) |
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| CAS Nummer | 7440-68-8 |
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| History |
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| Diskivery | Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940) |
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| Main isotopes o astatine |
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|
|
| | references |
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
302
|
—
|
—
|
|
|
| K
|
575
|
575
|
0
|
|
|
| F
|
576
|
576
|
0
|
|
|
| WD
|
String Module Error: Target string is empty ! 
|
|
|
|
| input
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C: 302, K: 575, F: 576
|
| comment
|
|
| style="text-align:left"|
|
|
|
in
|
calc from C
|
diff
|
report
|
ref
|
| C
|
337
|
—
|
—
|
|
|
| K
|
610
|
610
|
0
|
|
|
| F
|
639
|
639
|
0
|
|
|
| WD
|
503 !503 kelvin
|
|
|
[5]
|
| input
|
C: 337, K: 610, F: 639
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| comment
|
|
References
Thir references will appear in the airticle, but this list appears anerly on this page.
- ↑ Bonchev, Danail; Kamenska, Verginia (1981). "Predicting the properties of the 113–120 transactinide elements". The Journal of Physical Chemistry. ACS Publications. 85 (9): 1177–86. doi:10.1021/j150609a021.
- ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth–Heinemann. p. 28. ISBN 0080379419.
- ↑ Hermann, Andreas; Hoffmann, Roald; Ashcroft, N. W. (2013). "Condensed Astatine: Monatomic and Metallic". Physical Review Letters. 111 (11). doi:10.1103/PhysRevLett.111.116404.
- ↑ Rothe, S.; Andreyev, A. N.; Antalic, S.; Borschevsky, A.; Capponi, L.; Cocolios, T. E.; De Witte, H.; Eliav, E.; et al. (2013). "Measurement of the first ionization potential of astatine by laser ionization spectroscopy". Nature Communications. 4: 1835–. doi:10.1038/ncomms2819. PMC 3674244. PMID 23673620.
- ↑ "Estimation Chemical Form Boiling Point Elementary Astatine by Radio Gas Chromatography"; page: 201–203; date o publication: 1982; volume: 31.
