Atomic Symbol: At
Atomic Number: 85
Atomic Weight: (210)
Isotopes (radioactive): 210At, (t1/2 = 8.1 h), 211At, (t1/2 = 7.2 h)
1 Atm Melting Point: 575 K (estimate)
1 Atm Boiling Point: 610 K (estimate)
Common Valences: +5, +1, −1
Ionic Radii: (+V) 57, (−I) 227 ppm
Pauling Electronegativity: 2.2
First Ionization Potential: 899.0 kJ/mol
Chondritic (CI) Abundance:
Silicate Earth Abundance:
Crustal Abundance: trace amount in some minerals
Seawater Abundance: −
Core Abundance:
Properties
Astatine (Emsley 1991, 2001) is a reactive, radioactive nonmetal element which resembles iodine. The properties of astatine are not well established. It has been not extensively studied because all its isotopes have short half-lives. Much of what is known about astatine has been estimated from its position in the periodic table, below iodine, and by studying its chemistry in extremely dilute solutions.
History and Use
In 1931 a group of chemists led by Fred Allison reported that they...
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References
Emsley J (1991) The elements, 2nd edn. Clarendon Press, Oxford
Emsley J (2001) Nature’s building blocks an A-Z guide to the elements. Oxford University Press, Oxford
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Vasiliu, M., Dixon, D.A. (2018). Astatine. In: White, W.M. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39312-4_354
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DOI: https://doi.org/10.1007/978-3-319-39312-4_354
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