meitnerium, artificially produced radioactive chemical element; symbol Mt; at. no. 109; mass number of most stable isotope 266; m.p., b.p., sp. gr., and valence unknown. Situated in Group 9 of the periodic table it is expected to have properties similar to those of iridium.

In 1982 a German research team led by P. Armbruster and G. Münzenberg at the Institute for Heavy Ion Research at Darmstadt bombarded bismuth-209 atoms with iron-58 ions. On the tenth day of the experiment, one atom was unambiguously identified as an isotope of element 109 with mass number 266 and a half-life of 3.4 msec. The Germans suggested the name meitnerium to honor the Austrian-Swedish physicist and mathematician Lise Meitner. This name was recognized internationally in 1997.

See also synthetic elements; transuranium elements.

Atomic Number:	Atomic Number: 109
Atomic Symbol:	Atomic Symbol: Mt
	Name of Element: Meitnerium
Atomic Weight:	Atomic Weight: (266)
Electron Configuration:	Electron Configuration: 2 · 8 · 1832 · 3215 · 2