Meitnerium

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109 hassiummeitneriumdarmstadtium
Ir

Mt

(Upe)
General
Name, Symbol, Number meitnerium, Mt, 109
Chemical series transition metals
Group, Period, Block 9, 7, d
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (278)  g·mol−1
Electron configuration perhaps [Rn] 5f14 6d7 7s2
(guess based on iridium)
Electrons per shell 2, 8, 18, 32, 32, 15, 2
Phase presumably a solid
CAS registry number 54038-01-6
Selected isotopes
iso NA half-life DM DE (MeV) DP
276Mt syn 0.72 s
References

Meitnerium (pronounced /maɪtˈnɝiəm/), also called 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-276 with a half-life of 720 milliseconds.

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 (Gesellschaft für Schwerionenforschung) in Darmstadt.
The team bombarded a target of bismuth-209 with accelerated nuclei of iron-58 and isotope meitnerium-266 was produced:

The synthesis 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 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 (/ˌjuːnɪˈlɛniəm/, symbol Une) as a temporary, systematic element name. In 1997, however, the dispute was resolved and the current name was adopted.

External links

ar:مايتنريوم bn:মেইটনেরিয়াম be:Мейтнерый bs:Mitnerijum ca:Meitneri cs:Meitnerium co:Meitneriu da:Meitnerium de:Meitnerium et:Meitneerium el:Μαϊτνέριο eo:Mejtnerio fa:میتنریوم fur:Meitneri gl:Meitnerio (elemento) ko:마이트너륨 hy:Մայտներիում hr:Meitnerij it:Meitnerio he:מייטנריום ku:Meîtneryûm la:Meitnerium lb:Meitnerium lt:Meitneris jbo:jinmrmaitneri hu:Meitnerium nl:Meitnerium no:Meitnerium nn:Meitnerium sk:Meitnerium sr:Мајтнеријум sh:Meitnerij fi:Meitnerium sv:Meitnerium th:ไมต์เนเรียม uk:Майтнерій vec:Meitnèrio


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