|
Known properties |
Name, Symbol, Number
|
meitnerium, 109, Mt |
Chemical series
|
Transition metals
|
Group, Period, Block
|
9, 7 , d
|
Appearance
|
unknown; probably metallic,
silvery white or gray |
Atomic weight
|
[268] amu
|
Electron configuration
|
probably [Rn] 5f14 6d7 7s2
|
e- 's per energy level
|
2, 8, 18, 32, 32, 15, 2 |
State of matter
|
Presumably a solid |
Meitnerium (Eka-Iridium) is a chemical element in the periodic table that has the symbol Mt and atomic number 109. It is a synthetic element whose most stable isotope is Mt-266 with a half-life of 3.4 ms.
History
Meitnerium was first synthesized on August 29, 1982 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research at Darmstadt.
The team did this by bombing a target of bismuth-209 with accelerated nuclei of iron-58. The creation of this element demonstrated that nuclear fusion techniques could be used to make new, heavy nuclei.
The name meitnerium was suggested in honor of the Austrian-Swedish physicist and mathematician Lise Meitner, but there was an element naming controversy as to what the elements from 101 to 109 were to be called; thus IUPAC adopted unnilennium (symbol Une) as a temporary, systematic element name. However in 1997 they resolved the dispute and adopted the current name.
External links
- WebElements.com - Meitnerium http://www.webelements.com/webelements/elements/text/Mt/index.html
- EnvironmentalChemistry.com - Meitnerium http://environmentalchemistry.com/yogi/periodic/Mt.html
- Apsidium - Meitnerium http://www.apsidium.com/elements/109.htm
Last updated: 02-08-2005 13:13:07
Last updated: 05-03-2005 17:50:55