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Template:Infobox astatine

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Astatine, 85At
Template:Infobox element/symbol-to-top-image-alt
Astatine
PronunciationTemplate:Infobox element/pronunciation/format
Appearanceunknown, probably metallic
Mass number[210]
Astatine in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
 I 
↑
At
↓
Ts
polonium ← astatine → radon
Atomic number (Z)85
Groupgroup 17 (halogens)
Periodperiod 6
Block  p-block
Electron configuration[Xe] 4f14 5d10 6s2 6p5
Electrons per shell2, 8, 18, 32, 18, 7
Physical properties
Phase at STPsolid (predicted)
Density (near r.t.)8.91–8.95 g/cm3 (estimated)[1]
Molar volume23.6 cm3/mol (estimated)[1]
Atomic properties
Oxidation statescommon: −1, +1
+3,[2] +5,[2] +7[2]
Ionization energies
  • 1st: 899.003 kJ/mol[3]
Other properties
Natural occurrencefrom decay
Crystal structure ​face-centered cubic (fcc)
(predicted)[4]
CAS Number7440-68-8
History
NamingAncient Greek Template:Tlit (ἄστατος) Template:Gloss
DiscoveryDale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè (1940)
Isotopes of astatine
Main isotopes[5] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
207At synth 1.81 h β+90% 207Po
α10% 203Bi
208At synth 1.63 h β+99.5% 208Po
α0.55% 204Bi
209At synth 5.41 h β+96.1% 209Po
α3.9% 205Bi
210At synth 8.1 h β+99.8% 210Po
α0.175% 206Bi
211At synth 7.214 h ε58.2% 211Po
α41.8% 207Bi
File:Symbol category class.svg Category: Astatine
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References

  1. ↑ 1.0 1.1 Arblaster, JW, ed. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. p. 604. ISBN 978-1-62708-154-2.
  2. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
  3. ↑ 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...4.1835R. doi:10.1038/ncomms2819. PMC 3674244. PMID 23673620.
  4. ↑ 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.
  5. ↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.