WebElements Periodic Table » Meitnerium (original) (raw)
Meitnerium - 109Mt: the essentials
Name: meitnerium
Symbol: Mt
Atomic number: 109
Relative atomic mass (_A_r): [ 278 ] (longest lived isotope)
Standard state: presumably a solid at 298 K
Appearance: unknown, but probably metallic and silvery white or grey in appearance
Classification: Metallic
Group name: (none)
Shell structure: 2.8.18.32.32.15.2
CAS Registry: 54038-01-6
Meitnerium atoms have 109 electrons and the shell structure is 2.8.18.32.32.15.2. The ground state electronic configuration of neutral meitnerium is [Rn].5f14.6d7.7s2 (a guess based upon that of iridium) and the term symbol of meitnerium is 4F9/2 (a guess based upon guessed electronic structure).
Meitnerium: description
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Element 109, meitnerium, is a synthetic element that is not present in the environment at all. There is no dispute concerning the name meitnerium for element 109.
The interested reader should consult the on-line version of Creating Super Heavy Elements for a fascinating insight into research on "super-heavy" atoms.
Meitnerium: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of meitnerium where known.
Meitnerium: compound properties
Bond strengths; lattice energies of meitnerium halides, hydrides, oxides (where known); and reduction potentials where known.
Meitnerium: history
Meitnerium was discovered by Peter Armbruster, Gottfried Münzenber and their co-workers. in 1982 at Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: named after Lise "Meitner", the Austrian physicist.
Meitnerium: isolation
Isolation: only a few atoms of element 109, meitnerium, have ever been made. The first atoms were made through a nuclear reaction involving fusion of an isotope of bismuth, 209Bi, with one of iron, 58Fe.
209Bi + 58Fe → 266Mt + 1n
Isolation of an observable quantity of meitnerium has never been achieved, and may well never be. This is because meitnerium decays very rapidly through the emission of α-particles.