meitnerium

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Related to unnilennium: Element 109

meitnerium

meitnerium (mītnĭrˈēəm), artificially produced radioactive chemical element; symbol Mt; at. no. 109; mass number of most stable isotope 276; m.p., b.p., sp. gr., and valence unknown. Situated in Group 9 of the periodic table it is expected to have properties similar to those of iridium.

In 1982 a German research team led by P. Armbruster and G. Münzenberg at the Institute for Heavy Ion Research at Darmstadt bombarded bismuth-209 atoms with iron-58 ions. On the tenth day of the experiment, one atom was unambiguously identified as an isotope of element 109 with mass number 266 and a half-life of 3.4 msec. The Germans suggested the name meitnerium to honor the Austrian-Swedish physicist and mathematician Lise Meitner. This name was recognized internationally in 1997. The most stable isotope of meitnerium, meitnerium-276, has a half-life of 0.72 sec.

See also synthetic elements; transuranium elements.

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meitnerium

[mīt′nir·ē·əm]
(chemistry)
A chemical element, symbolized Mt, atomic number 109, a synthetic element; the seventeenth transuranium element.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

meitnerium

a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no.: 109
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005