Os Ir Pt Bh Hs Mt -- -- -- Element Fact Fluorine is the most reactive element, which reacts practically with all organic and inorganic substances, including metals, glass and ceramics, often with violent effects.

Meitnerium, Mt Atomic number: 109 Atomic mass: [268] (no stable nuclide) Natural abundance: - Isotopes: - History and Production Named after Lise Meitner (1878-1968), a physicist and mathematician. It was first identified in 1992 by P. Armbruster and G. Münzenberg from Darmstadt, Germany, by bombarding 209Bi with energetic 58Fe. The production can be achieved only in atomistic quantities. A week of bombardment may only produce a single atom of Element 109. In 1994, scientists at Dubna, Russia used a much higher irradiation dose and found the existence of 266Mt. The name meitnerium was adopted by IUPAC in 1997. Physical Data Only a few atoms have been produce and thus its physical properties cannot be determined. Interatomic distance: - Melting point: n/a Boiling point: n/a Thermal conductivity/Wm-1K-1: n/a Density/kgm-3: n/a Standard Thermodynamic Data (atomic gas) Enthalpy of formation: - Gibbs free energy of formation: - Entropy: - Heat capacity: - Electronic data Electronic configuration: Electronic configuration: [Rn] 5f14 6d7 7s2 Term symbol: 4F9/2 Electron affinity: -   Electronegativity (Pauline): - Ionization energy (first, second, third): -, -, - kJ/mol Chemical properties

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