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| Known properties |
| Name, Symbol, Number | meitnerium, 109, Mt |
| Chemical series | Transition metals |
| Group, Period, Block | 9, 7, d |
| Appearance | unknown |
| 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 bombarding 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.
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