The mineralogy of Francium
| General Properties | |
|---|---|
| Symbol: | Fr |
| Atomic Number: | 87 |
| Standard atomic weight (Ar): | [223] |
| Electron configuration: | [Rn] 7s1 |
| Atomic Properties | |
|---|---|
| Electronegativity (Pauling scale): | 0.7 |
| Ionic Radius: | 180 pm (+1) |
| 1st Ionization energy: | 380 kJ/mol |
| Oxidation States: | 1 |
| Physical Properties | |
|---|---|
| Standard State: | solid |
| Bonding Type: | metallic |
| Metal/Non-Metal: | alkali metal |
| Main isotopes of Francium | ||||
|---|---|---|---|---|
| Isotope | % in Nature | Half Life | Decay type | Decay product |
| 221Fr | trace | 4.8min | α | 217At |
| 222Fr | synthetic | 14.2min | β− | 222Ra |
| 223Fr | trace | 22.00min | β− | 223Ra |
| α | 219At | |||
| Other Information | |
|---|---|
| Year Discovered: | 1939 |
| Discovered By: |  Marguerite Perey |
| Year Isolated: | 1939 |
| Isolated By: | Marguerite Perey |
| Named For: |  France, homeland of the discoverer |
| CPK color coding: | #420066 |
| External Links: | WikipediaWebElementsLos Alamos National LaboratoryTheodore Gray's PeriodicTable.com |
| Geochemistry of Francium | |
|---|---|
| Goldschmidt classification: | Lithophile |
| Periodic Table | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Radon << Francium >> Radium | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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.
