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Astatine, 85 At Astatine Pronunciation (Template:Respell ) Appearance unknown, probably metallic Mass number [210] Astatine in the periodic table
Atomic number (Z ) 85 Group group 17 (halogens) Period period 6 Block p-block Element categories , sometimes classified as a nonmetal, a metalloid, or a metal[2] Electron configuration [Xe ] 4f14 5d10 6s2 6p5 Electrons per shell 2, 8, 18, 32, 18, 7 Physical properties Phase at STP solid Boiling point (At2 ) 503±3 K (230±3 °C, 446±5 °F) (estimated) [3] Density (near r.t. ) (At2 ) 6.35±0.15 g/cm3 (predicted) [4] Molar volume (At2 ) 32.94 cm3 /mol (predicted) [4] Heat of vaporization (At2 ) 54.39 kJ/mol[5] Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
361
392
429
475
531
607
Atomic properties Oxidation states −1 , +1 , +3, +5, +7[6] Electronegativity Pauling scale: 2.2 Ionization energies Covalent radius 150 pm Van der Waals radius 202 pm Other properties Natural occurrence from decay Crystal structure face-centered cubic (fcc)(predicted) [2] Thermal conductivity 1.7 W/(m·K) CAS Number 7440-68-8 History Naming after Greek astatos (αστατος), meaning "unstable" Discovery Dale R. Corson , Kenneth Ross MacKenzie , Emilio Segrè (1940) Main isotopes of astatine
Category: Astatine | references
[[Category:Infobox templates|Template:Remove first word ]]Check temperatures At: no input for C, K, F.
References
These references will appear in the article, but this list appears only on this page.
↑ Jump up to: 2.0 2.1 Hermann, A.; Hoffmann, R.; Ashcroft, N. W. (2013). "Condensed Astatine: Monatomic and Metallic". Physical Review Letters . 111 (11): 116404-1–116404-5. Bibcode :2013PhRvL.111k6404H . doi :10.1103/PhysRevLett.111.116404 . PMID 24074111 .
↑ Otozai, K.; Takahashi, N. (1982). "Estimation Chemical Form Boiling Point Elementary Astatine by Radio Gas Chromatography" . Radiochimica Acta . 31 (3–4): 201–203. doi :10.1524/ract.1982.31.34.201 .
↑ Jump up to: 4.0 4.1 Bonchev, D.; Kamenska, V. (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 . Retrieved 6 May 2013 .
↑ Glushko, V. P.; Medvedev, V. A.; Bergma, G. A. (1966). Termicheskie Konstanty Veshchestv (in Russian). 1 . Nakua. p. 65.
↑ Greenwood, Norman N. ; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann . p. 28. ISBN 978-0-08-037941-8 .
↑ 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 : 1–6. Bibcode :2013NatCo...4E1835R . doi :10.1038/ncomms2819 . PMC 3674244 . PMID 23673620 .
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