Template:Infobox astatine

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[[Category:Template:Pagetype with short description]]

Astatine, 85At
Astatine
Pronunciation/ˈæstətn, -tɪn/ (Template:Respell)
Appearanceunknown, probably metallic
Mass number[210]
Astatine in the periodic table
Template:Periodic table (32 columns, micro)  I 

At

Ts
poloniumastatineradon
Atomic number (Z)85
Groupgroup 17 (halogens)
Periodperiod 6
Block  p-block
Element categories, sometimes classified as a nonmetal, a metalloid, or a metal[1][2]
Electron configuration[Xe] 4f14 5d10 6s2 6p5
Electrons per shell2, 8, 18, 32, 18, 7
Physical properties
Phase at STPsolid
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]
ElectronegativityPauling scale: 2.2
Ionization energies
  • 1st: 899.003 kJ/mol[7]
Covalent radius150 pm
Van der Waals radius202 pm
Other properties
Natural occurrencefrom decay
Crystal structureface-centered cubic (fcc)
Face-centered cubic crystal structure for astatine

(predicted)[2]
Thermal conductivity1.7 W/(m·K)
CAS Number7440-68-8
History
Namingafter Greek astatos (αστατος), meaning "unstable"
DiscoveryDale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Main isotopes of astatine
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
209At syn 5.41 h β+ 209Po
α 205Bi
210At syn 8.1 h β+ 210Po
α 206Bi
211At syn 7.21 h ε 211Po
α 207Bi
Category Category: Astatine
| references

[[Category:Infobox templates|Template:Remove first word]]Check temperatures At: no input for C, K, F.

data b.p. cat
in calc from C diff report ref
C 230
K 503 503 0
F 446 446 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 230±3, K: 503±3, F: 446±5
comment (estimated)[3]
Po ←

i'box Po

iso
85
At (E)
→ Rn

i'box Rn

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. Corson, MacKenzie & Segrè 1940.
  2. 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.
  3. 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.
  4. 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.
  5. Glushko, V. P.; Medvedev, V. A.; Bergma, G. A. (1966). Termicheskie Konstanty Veshchestv (in Russian). 1. Nakua. p. 65.
  6. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. ISBN 978-0-08-037941-8.
  7. 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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