The element Meitnerium (Mt) was first synthesised.
The radioactive synthetic element with an atomic number of 109 and the symbol Mt was first created at the GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany. Named after Austrian physicist and discoverer of nuclear fission, Lise Meitner, the element, which is not found naturally, was discovered by a team headed by Peter Armbruster and Gottfried Münzenberg.