The mineralogy of Astatine
| General Properties | |
|---|---|
| Symbol: | At |
| Atomic Number: | 85 |
| Standard atomic weight (Ar): | [210] |
| Electron configuration: | [Xe] 4f14 5d10 6s2 6p5 |
| Atomic Properties | |
|---|---|
| Electronegativity (Pauling scale): | 2.2 |
| Atomic Radius: | 127 pm |
| Ionic Radius: | 62 pm (+7) |
| 1st Ionization energy: | 920 kJ/mol |
| 1st Electron affinity: | -270 kJ/mol |
| Oxidation States: | -1,1,3,5 |
| Physical Properties | |
|---|---|
| Standard State: | solid |
| Bonding Type: | covalent network |
| Melting Point: | 575 K |
| Metal/Non-Metal: | halogen |
| Main isotopes of Astatine | ||||
|---|---|---|---|---|
| Isotope | % in Nature | Half Life | Decay type | Decay product |
| 209At | synthetic | 5.41h | β+ | 209Po |
| α | 205Bi | |||
| 210At | synthetic | 8.1h | β+ | 210Po |
| α | 206Bi | |||
| 211At | synthetic | 7.21h | ε | 211Po |
| α | 207Bi | |||
| Main ions of Astatine | ||||
|---|---|---|---|---|
| Name | Ion | Example minerals | ||
| astatine(I) | At+ | |||
| astatine(III) | At3+ | |||
| astatine(V) | At5+ | |||
| astatine(VII) | At7+ | |||
| astatide | At- | |||
| Other Information | |
|---|---|
| Year Discovered: | 1940 |
| Discovered By: |  Dale R. Corson  Kenneth Ross MacKenzie  Emilio Segrè Dale R. Corson, Kenneth Ross MacKenzie, Emilio Segrè |
| Named For: | Greek: astatos - "unstable" |
| CPK color coding: | #754F45 |
| External Links: | WikipediaWebElementsLos Alamos National LaboratoryTheodore Gray's PeriodicTable.com |
| Geochemistry of Astatine | |
|---|---|
| Goldschmidt classification: | Lithophile |
| Periodic Table | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Polonium << Astatine >> Radon | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Spotted a mistake/omission? - These pages are a work in progress, so please send all comments/corrections to jolyon@mindat.org. Thank you.
Constants and physical property data from:
Lide, David R. - Ed. (2005) CRC Handbook of Chemistry and Physics - A Ready-Reference Book of Chemical and Physical Data (85th ed.). CRC Press.
National Physical Laboratory (2005) Kaye and Laby Online (discontinued). https://web.archive.org/web/20190506031327/http://www.kayelaby.npl.co.uk/
Kaye, G. W. C.; Laby, T. H. (n.d.) Tables of Physical and Chemical Constants and some Mathematical Functions. Longmans, Green, and Co.
Greenwood, N.N.; Earnshaw, A. (1997) Chemistry of the Elements (2nd ed.). Butterworth–Heinemann.
Ahrens, Thomas J. - Ed. (1995) Global Earth Physics - A Handbook of Physical Constants - AGU Reference Shelf No. 1. American Geophysical Union.
Railsback, L. Bruce (2003) An earth scientist's periodic table of the elements and their ions. Geology, 31 (9) 737 doi:10.1130/g19542.1
Emsley, John (2001) Nature's Building Blocks - An A-Z Guide to the Elements. Oxford University Press, Oxford.