SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Meitnerium (Mt). Diagram of the nuclear composition and electron configuration of an atom of meitnerium-278 (atomic number: 109), the most stable isotope of this radioactive element. The nucleus consists of 109 protons (red) and 169 neutrons (blue). Meitnerium, named after Lise Meitner and first synthesised in 1982, is a transactinide of unknown properties in group 9, period 7, and the d-block of the periodic table. Meitnerium-278 has a half-life of 7.6 seconds, its nucleus emitting an alpha particle to form bohrium-274.
Model release not required. Property release not required.