meitnerium

hassium – meitnerium – darmstadtium
Ir Mt
	Full table

Known properties

Name, Symbol, Number

meitnerium, 109, Mt

Chemical series

9, 7, d

Appearance

unknown

Atomic weight

Electron configuration

probably [Rn] 5f¹⁴ 6d⁷ 7s²

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 Mnzenberg 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.

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