Astatine Elemental Symbol
Astatine



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Astate Astat Astato Astato Astato Astat

Astatine Bohr ModelAstatine is a Block P, Group 17, Period 6 element. The number of electrons in each of Astatine's shells is 2, 8, 18, 32, 18, 7 and its electron configuration is [Xe] 4f14 5d10 6s2 6p5. The Astatine atom has a covalent radius of 150.pm and it's Van der Waals radius is 202.pm. In its elemental form, Astatine's CAS number is 7440-68-8 and its appearance is unknown. Astatine is the rarest naturally occurring non-transuranic element. The amount of naturally occurring astatine in the world is about 25g. Astatine was discovered by Dale R. Corson, Kenneth Ross MacKenzie and Emilio Segrè in 1940.

Astatine is highly radioactive. Astatine information, including technical data, safety data and its high purity properties, research, applications and other useful facts are specified below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.


  • Properties
  • Research
  • Isotopes
  • Other Elements

Astatine Properties


GENERAL PROPERTIES   PHYSICAL PROPERTIES  
Symbol: At Melting Point: 575 K, 302 °C, 576 °F
Atomic Number: 85 Boiling Point: 610 K, 337 °C, 639 °F
Atomic Weight: 210 Density: 6.2–6.5 g·cm−3 (predicted)
Element Category: halogen Liquid Density @ Melting Point: N/A
Group, Period, Block: 17 (halogens), 6, p Specific Heat: N/A
    Heat of Vaporization 585.22 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 23.81 kJ mol-1
Electrons: 85 Thermal Conductivity: 1.7 W·m−1·K−1
Protons: 85 Thermal Expansion: N/A
Neutrons: 125 Electrical Resistivity: N/A
Electron Configuration: [Xe]6s24f145d106p5  Electronegativity: 2.2 (Pauling scale)
Atomic Radius: N/A Tensile Strength: N/A
Covalent Radius: 150 pm Molar Heat Capacity: N/A
Van der Waals radius: 202 pm Young's Modulus: N/A
Oxidation States: 7, 5, 3, 1, -1 Shear Modulus: N/A
Phase: Solid Bulk Modulus: N/A
Crystal Structure: N/A Poisson Ratio: N/A
Magnetic Ordering: N/A Mohs Hardness: N/A
1st Ionization Energy: 887.7±38.59 kJ·mol−1 Vickers Hardness: N/A
2nd Ionization Energy: N/A Brinell Hardness: N/A
3rd Ionization Energy: N/A Speed of Sound: N/A
       
IDENTIFIERS   MISCELLANEOUS  
CAS Number: 7440-68-8 Abundance in typical human body, by weight: N/A
ChemSpider ID: 4573995 Abundance in typical human body, by atom: N/A
PubChem CID: 5460479 Abundance in universe, by weight: N/A
MDL Number: N/A Abundance in universe, by atom: N/A
EC Number: N/A Discovered By: Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè
Beilstein Number: N/A Discovery Date: 1940
SMILES Identifier: [At]  
InChI Identifier: InChI=1S/At Other Names: Astat, Astato
InChI Key: RYXHOMYVWAEKHL-UHFFFAOYSA-N  
       
       
       
       
       


Recent Research & Development for Astatine

  • C. Fry, M. Thoennessen, Discovery of the astatine, radon, francium, and radium isotopes, Atomic Data and Nuclear Data Tables, Volume 99, Issue 5, September 2013
  • Susanta Lahiri, Kamalika Roy, Souvik Sen, Complexation study on no-carrier-added astatine with insulin: A candidate radiopharmaceutical, Applied Radiation and Isotopes, Volume 66, Issue 12, December 2008
  • Kamalika Roy, Susanta Lahiri, Production and separation of Astatine Radionuclides: Some new addition to Astatine Chemistry, Applied Radiation and Isotopes, Volume 66, Issue 5, May 2008
  • Stig Palm, Tom Bäck, Ingela Claesson, Anna Danielsson, Jörgen Elgqvist, Sofia Frost, Ragnar Hultborn, Holger Jensen, Sture Lindegren, Lars Jacobsson, Therapeutic Efficacy of Astatine-211–Labeled Trastuzumab on Radioresistant SKOV-3 Tumors in Nude Mice, International Journal of Radiation Oncology*Biology*Physics, Volume 69, Issue 2, 1 October 2007
  • A. Boskovitz, H. Ochiai, T. Okamura, X.-G. Zhao, D. Bigner, M. Zalutsky, 296 Trastuzumab monoclonal antibody labeled with alpha-particle emitter astatine: targeted radiotherapeutic experiments on a HER2-positive breast carcinomatous meningitis animal model after intrathecal administration, European Journal of Cancer Supplements, Volume 2, Issue 8, September 2004
  • Kamalika Roy, S. Basu, A. Ramaswami, Dalia Nayak, Susanta Lahiri, Incorporation of thiosemicarbazide in Amberlite IRC-50 for separation of astatine from a-irradiated bismuth oxide, Applied Radiation and Isotopes, Volume 60, Issue 6, June 2004
  • Turan Ünak, Some microdosmetric data on Astatine-211, Applied Radiation and Isotopes, Volume 58, Issue 1, January 2003
  • Sture Lindegren, Tom Bäck, Holger J. Jensen, Dry-distillation of astatine-211 from irradiated bismuth targets: a time-saving procedure with high recovery yields, Applied Radiation and Isotopes, Volume 55, Issue 2, August 2001
  • , Project title astatine and iodine radiolabeled monoclonal antibodies, Academic Radiology, Volume 7, Issue 5, May 2000
  • Craig J Reist, Catherine F Foulon, Kevin Alston, Darell D Bigner, Michael R Zalutsky, Astatine-211 labeling of internalizing anti-EGFRvIII monoclonal antibody using N-succinimidyl 5-[211At]astato-3-pyridinecarboxylate, Nuclear Medicine and Biology, Volume 26, Issue 4, May 1999

Astatine Isotopes


Astatine (At) has no stable isotopes. All of its 37 known isotopes, ranging from 191At to 229At, are radioactive.