Difference between revisions of "Actinium"
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| − | '''Actinium''' (symbol: '''Ac''') is a [[chemical element]], one of the [[transition metal]]s and also an [[actinoid]]. All [[isotope]]s of actinium are [[Radioactivity|unstable]], with [[Half-life|half-lives]] of less than 22 years:<ref>{{NUBASE2003}}.</ref> | + | '''Actinium''' (symbol: '''Ac''') is a [[chemical element]], one of the [[transition metal]]s and also an [[actinoid]]. All [[isotope]]s of actinium are [[Radioactivity|unstable]], with [[Half-life|half-lives]] of less than 22 years:<ref name="NUBASE">{{NUBASE2003}}.</ref> however, [[actinium-227]] (''t''<sub>½</sub> = 21.772(3) a) is formed as a decay product of [[uranium-235]] (''t''<sub>½</sub> = {{nowrap|704(1){{e|6}} a}}) and so small amounts of actinium are present in all samples of natural uranium. |
==Notes and references== | ==Notes and references== | ||
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Actinium (symbol: Ac) is a chemical element, one of the transition metals and also an actinoid. All isotopes of actinium are unstable, with half-lives of less than 22 years:[6] however, actinium-227 (t½ = 21.772(3) a) is formed as a decay product of uranium-235 (t½ = 704(1) × 106 a) and so small amounts of actinium are present in all samples of natural uranium.
Notes and references
Notes
References
- ↑ 1.0 1.1 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1102–10. ISBN 0-08-022057-6.
- ↑ Sugar, Jack Ionization energies of the neutral actinides. J. Chem. Phys. 1973, 59, 788–91. DOI: 10.1063/1.1680091. Sugar, Jack Revised ionization energies of the neutral actinides. J. Chem. Phys. 1974, 60, 4103. DOI: 10.1063/1.1680874.
- ↑ Moore, Charlotte E. Ionization potentials and ionization limits derived from the analyses of optical spectra. Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.) 1970, 34, 1–22, <http://www.nist.gov/data/nsrds/NSRDS-NBS34.pdf>.
- ↑ Cordero, Beatriz; Gómez, Verónica; Platero-Prats, Ana E.; Revés, Marc; Echeverría, Jorge; Cremades, Eduard; Barragán, Flavia; Alvarez, Santiago Covalent radii revisited. Dalton Trans. 2008 (5), 2832–38. DOI: 10.1039/b801115j.
- ↑ Shannon, R. D. Revised effective ionic radii and systematic studies of interatomic distances in halids and chalcogenides. Acta Crystallogr. A 1976, 32 (5), 751–67. DOI: 10.1107/S0567739476001551.
- ↑ Audi, G.; Bersillon, O.; Blachot, J.; Wapstra, A. H. The NUBASE evaluation of nuclear and decay properties. Nucl. Phys. A 2003, 729, 3–128. doi:10.1016/j.nuclphysa.2003.11.001, <http://amdc.in2p3.fr/nubase/Nubase2003.pdf>.
Further reading
- Kirby, H. W.; Morss, L. R. Actinium. In The Chemistry of the Actinide and Transactinide Elements, 3rd ed.; Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean, Eds.; Springer: Dordrecht, the Netherlands, 2006; Vol. 1, Chapter 2, pp 18–51. doi:10.1007/1-4020-3598-5_2, <http://radchem.nevada.edu/classes/rdch710/files/actinium.pdf>.
External links
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See also the corresponding article on Wikipedia. |
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