Meitnerium (Eka-Iridium) occurs as chemical element in the periodic table that has the symbol Mt & atomic number 109. These are the synthetic element whose most stable isotope is Mt-266 by having the half-life of 3.4 ms.

History
Meitnerium was first synthesized on August 29, 1982 by a German locate 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. A creation of this element demonstrated that nuclear fusion techniques could be utilized to produce newly, heavily nuclei.

A title element 109 was suggested around honor of the Austrian-Swedish physicist & mathematician Lise Meitner, but there was an element naming controversy as to what the elements from either 101 to 109 were to exist as known as; so IUPAC adopted unnilennium (symbol Une) as a temporary, systematic element name. Nevertheless within 1997 they resolved a dispute & adopted the todays title.