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roentgenium

The Columbia Encyclopedia, Sixth Edition | 2008 | Copyright

roentgenium artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 272; m.p., b.p., sp. gr., and valence unknown. Situated in Group 11 of the periodic table , it is expected to have properties similar to those of gold .

In 1994 an international research team led by Peter Armbruster and Sigurd Hofmann at the Institute for Heavy Ion Research at Darmstadt, Germany bombarded bismuth-209 atoms with nickel-64 ions. In an 18-day experiment, three atoms were unambiguously identified as an isotope of element 111 with mass number 272 and a half-life of 1.5 msec. The discovery was officially confirmed in 2003, and the discoverers named the element in honor of Wilhelm Conrad Roentgen .

See also synthetic elements ; transactinide elements ; transuranium elements .

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Related newspaper, magazine, and trade journal articles from HighBeam Research

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	Element number 111.(new chemical element named roentgenium)(Brief Article) Magazine article from: Canadian Chemical News September 1, 2004 700+ words ...the element. The Inorganic Chemistry Division Committee now recommends this proposal for acceptance. The proposed name is roentgenium with symbol Rg. This proposal lies within the long established tradition of naming elements to honour famous scientists...
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	Reports outline optical physics study results from University of Kassel. Newspaper article from: Physics Week June 9, 2009 700+ words ...with experiment the alkali dimers exhibit different behaviour than the dimers of group 11, the noble metal group including roentgenium (Rg, Z = 111), which were investigated in our previous papers," wrote O. Kullie and colleagues, University of Kassel...
	Upper limit in the periodic table of elements. Magazine article from: Progress in Physics Khazan, Albert January 1, 2007 700+ words ...slope 1. With the view to expansion of the basis of the arguments, this example is given for the first Group including "roentgenium" No. 111, a more recently identified element, and the predicted No. 119 and No. 155. The real axis is shown here...
	Scientists Announce Creation of Atomic Element, the Heaviest Yet Newspaper article from: The Washington Post Rick Weiss - Washington Post Staff Writer October 17, 2006 700+ words ...two years later when it became clear that the results were fraudulent. The last new element to be confirmed was No. 111, roentgenium, discovered in 1994. But scientists involved in the new find -- and others who reviewed the report, published in the...
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