Difference between revisions of "Actinoid"
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An '''actinoid''' or '''actinide'''{{#tag:ref|IUPAC prefers the term "actinoid", as "actinide" refers to a binary compound of actinium with a more electropositive metal.<ref name="RedBook"/>|group="Note"}} is an [[Chemical element|element]] with an [[atomic number]] between 89 and 103, that is, one of [[Actinium|Ac]], [[Thorium|Th]], [[Protactinium|Pa]], [[Uranium|U]], [[Neptunium|Np]], [[Plutonium|Pu]], [[Americium|Am]], [[Curium|Cm]], [[Berkelium|Bk]], [[Californium|Cf]], [[Einsteinium|Es]], [[Fermium|Fm]], [[Mendelevium|Md]], [[Nobelium|No]] or [[Lawrencium|Lr]].<ref name="RedBook">{{RedBook2005|pages=51–52}}.</ref> Although actinoid means "like [[actinium]]" and so should not include actinium itself, Ac is usually included in modern usage.<ref name="RedBook"/><ref>{{IUPAC periodic table}}.</ref> The idea of a series of fourteen elements (now fifteen) analogous to the [[lanthanoid]]s was proposed by [[Glenn Seaborg]] in 1946.<ref>{{citation | first = Glenn T. | last = Seaborg | journal = Science | year = 1946 | volume = 104 | pages = 379–86 | doi = 10.1126/science.104.2704.379 | title = The Transuranium Elements}}.</ref> | An '''actinoid''' or '''actinide'''{{#tag:ref|IUPAC prefers the term "actinoid", as "actinide" refers to a binary compound of actinium with a more electropositive metal.<ref name="RedBook"/>|group="Note"}} is an [[Chemical element|element]] with an [[atomic number]] between 89 and 103, that is, one of [[Actinium|Ac]], [[Thorium|Th]], [[Protactinium|Pa]], [[Uranium|U]], [[Neptunium|Np]], [[Plutonium|Pu]], [[Americium|Am]], [[Curium|Cm]], [[Berkelium|Bk]], [[Californium|Cf]], [[Einsteinium|Es]], [[Fermium|Fm]], [[Mendelevium|Md]], [[Nobelium|No]] or [[Lawrencium|Lr]].<ref name="RedBook">{{RedBook2005|pages=51–52}}.</ref> Although actinoid means "like [[actinium]]" and so should not include actinium itself, Ac is usually included in modern usage.<ref name="RedBook"/><ref>{{IUPAC periodic table}}.</ref> The idea of a series of fourteen elements (now fifteen) analogous to the [[lanthanoid]]s was proposed by [[Glenn Seaborg]] in 1946.<ref>{{citation | first = Glenn T. | last = Seaborg | journal = Science | year = 1946 | volume = 104 | pages = 379–86 | doi = 10.1126/science.104.2704.379 | title = The Transuranium Elements}}.</ref> | ||
Latest revision as of 06:24, 26 December 2010
An actinoid or actinide[Note 1] is an element with an atomic number between 89 and 103, that is, one of Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No or Lr.[1] Although actinoid means "like actinium" and so should not include actinium itself, Ac is usually included in modern usage.[1][2] The idea of a series of fourteen elements (now fifteen) analogous to the lanthanoids was proposed by Glenn Seaborg in 1946.[3]
Notes and references
Notes
References
- ↑ 1.0 1.1 1.2 Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; pp 51–52. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.
- ↑ Periodic Table of the Elements; International Union of Pure and Applied Chemistry (IUPAC), <http://old.iupac.org/reports/periodic_table/index.html>. (accessed 25 December 2010).
- ↑ Seaborg, Glenn T. The Transuranium Elements. Science 1946, 104, 379–86. DOI: 10.1126/science.104.2704.379.
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