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transactinide elements
transactinide elements , in chemistry, elements with atomic numbers greater than that of lawrencium (at. no. 103), the last member of the actinide series. See transuranium elements . |
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"transactinide elements." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "transactinide elements." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1E1-trnsactel.html "transactinide elements." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-trnsactel.html |
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transactinide elements
transactinide elements Elements with an atomic number greater than 103, i.e. elements above lawrencium in the periodic table. So far, elements upto 116 have been detected. Because of the highly radioactive and transient nature of these elements, there has been much dispute about priority of discovery and, consequently, naming of the elements. The International Union of Pure and Applied Chemistry (IUPAC) introduced a set of systematic temporary names based on affixes, as shown in the table.
All these element names end in -ium. So, for example, element 109 in this system is called un + nil + enn + ium, i.e. unnilennium, and given the symbol u+n+e, i.e. Une. One long-standing dispute was about the element 104(rutherfordium), which has also been called kurchatovium (Ku). There have also been disputes between IUPAC and the American Chemical Union about element names. In 1994 IUPAC suggested the following list:mendelevium (Md, 101)nobelium (No, 102)lawrencium (Lr, 103)dubnium (Db, 104)joliotium (Jl, 105)rutherfordium (Rf, 106)bohrium (Bh, 107)hahnium (Hn, 108)meitnerium (Mt, 109) The ACU favoured a different set of names: mendelevium (Md, 101)nobelium (No, 102)lawrencium (Lr, 103)rutherfordium (Rf, 104)hahnium (Ha, 105)seaborgium (Sg, 106)nielsbohrium (Ns, 107)hassium (Hs, 108)meitnerium (Mt, 109) A compromise list was adopted by IUPAC in 1997 and is generally accepted:mendelevium (Md, 101)nobelium (No,02)lawrencium (Lr, 103)rutherfordium (Rf, 104)dubnium (Db, 105)seaborgium (Sg, 106)bohrium (Bh, 107)hassium (Hs, 108)meitnerium (Mt, 109) Element 110 was named as darmstadtium in 2003 and element 111 was named roentgenium in 2004. So far elements 112 (ununbium, Uub),113 (ununtrium, Uut), 114 (ununquadium, Uuq), 115 (ununpentium, Uup), and 116 (ununhexium, Uuh) are not officially named. All these elements are unstable and have very short half-lives. |
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Cite this article
"transactinide elements." A Dictionary of Chemistry. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. "transactinide elements." A Dictionary of Chemistry. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O81-transactinideelements.html "transactinide elements." A Dictionary of Chemistry. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O81-transactinideelements.html |
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transactinide element
transactinide element An element with an atomic number greater than 103.
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Cite this article
ALAN ISAACS. "transactinide element." A Dictionary of Physics. 2000. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. ALAN ISAACS. "transactinide element." A Dictionary of Physics. 2000. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O83-transactinideelement.html ALAN ISAACS. "transactinide element." A Dictionary of Physics. 2000. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O83-transactinideelement.html |
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