Meitnerium is a synthetic element with the chemical symbol Mt and atomic number 109. It was first discovered in 1982 by a team of scientists at the GSI Helmholtz Centre for Heavy Ion Research in Germany. Meitnerium is named in honor of physicist Lise Meitner, who contributed to the discovery of nuclear fission. As a member of the d-block in the periodic table, meitnerium is classified as a transition metal. It is highly radioactive and has no stable isotopes, with the most stable isotope, Mt-278, having a half-life of about 7.6 seconds. Due to its short half-life, meitnerium has no significant commercial applications.