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Chemical Element Meitnerium Is Synthesized (1982) Options
Daemon
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Chemical Element Meitnerium Is Synthesized (1982)

In 1982, a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research created a new element. While bombarding bismuth-209 atoms with iron-58 ions, they detected a single atom of what is now called meitnerium. Its atomic number is 109. The artificially-produced, radioactive element is named for Lise Meitner, the Austrian-Swedish physicist and mathematician who helped discover nuclear fission. When was the name "meitnerium" officially adopted? More...
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Chemical Element Meitnerium Is Synthesized (1982)
In 1982, a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research created a new element. While bombarding bismuth-209 atoms with iron-58 ions, they detected a single atom of what is now called meitnerium. Its atomic number is 109. The artificially-produced, radioactive element is named for Lise Meitner, the Austrian-Swedish physicist and mathematician who helped discover nuclear fission.
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Meitnerium
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Related to Meitnerium: Roentgenium, darmstadtium
Meitnerium, 109Mt General properties
Pronunciation /maɪtˈnɪəriəm/[1] or /ˈmaɪtnəriəm/[2]
myt-NEER-ee-əm or MYT-nər-ee-əm
Meitnerium in the periodic table
Hydrogen (diatomic nonmetal)

Helium (noble gas)
Lithium (alkali metal)

Beryllium (alkaline earth metal)

Boron (metalloid)

Carbon (polyatomic nonmetal)

Nitrogen (diatomic nonmetal)

Oxygen (diatomic nonmetal)

Fluorine (diatomic nonmetal)

Neon (noble gas)
Sodium (alkali metal)

Magnesium (alkaline earth metal)

Aluminium (post-transition metal)

Silicon (metalloid)

Phosphorus (polyatomic nonmetal)

Sulfur (polyatomic nonmetal)

Chlorine (diatomic nonmetal)

Argon (noble gas)
Potassium (alkali metal)

Calcium (alkaline earth metal)

Scandium (transition metal)

Titanium (transition metal)

Vanadium (transition metal)

Chromium (transition metal)

Manganese (transition metal)

Iron (transition metal)

Cobalt (transition metal)

Nickel (transition metal)

Copper (transition metal)

Zinc (transition metal)

Gallium (post-transition metal)

Germanium (metalloid)

Arsenic (metalloid)

Selenium (polyatomic nonmetal)

Bromine (diatomic nonmetal)

Krypton (noble gas)
Rubidium (alkali metal)

Strontium (alkaline earth metal)

Yttrium (transition metal)

Zirconium (transition metal)

Niobium (transition metal)

Molybdenum (transition metal)

Technetium (transition metal)

Ruthenium (transition metal)

Rhodium (transition metal)

Palladium (transition metal)

Silver (transition metal)

Cadmium (transition metal)

Indium (post-transition metal)

Tin (post-transition metal)

Antimony (metalloid)

Tellurium (metalloid)

Iodine (diatomic nonmetal)

Xenon (noble gas)
Caesium (alkali metal)

Barium (alkaline earth metal)

Lanthanum (lanthanide)

Cerium (lanthanide)

Praseodymium (lanthanide)

Neodymium (lanthanide)

Promethium (lanthanide)

Samarium (lanthanide)

Europium (lanthanide)

Gadolinium (lanthanide)

Terbium (lanthanide)

Dysprosium (lanthanide)

Holmium (lanthanide)

Erbium (lanthanide)

Thulium (lanthanide)

Ytterbium (lanthanide)

Lutetium (lanthanide)

Hafnium (transition metal)

Tantalum (transition metal)

Tungsten (transition metal)

Rhenium (transition metal)

Osmium (transition metal)

Iridium (transition metal)

Platinum (transition metal)

Gold (transition metal)

Mercury (transition metal)

Thallium (post-transition metal)

Lead (post-transition metal)

Bismuth (post-transition metal)

Polonium (post-transition metal)

Astatine (metalloid)

Radon (noble gas)
Francium (alkali metal)

Radium (alkaline earth metal)

Actinium (actinide)

Thorium (actinide)

Protactinium (actinide)

Uranium (actinide)

Neptunium (actinide)

Plutonium (actinide)

Americium (actinide)

Curium (actinide)

Berkelium (actinide)

Californium (actinide)

Einsteinium (actinide)

Fermium (actinide)

Mendelevium (actinide)

Nobelium (actinide)

Lawrencium (actinide)

Rutherfordium (transition metal)

Dubnium (transition metal)

Seaborgium (transition metal)

Bohrium (transition metal)

Hassium (transition metal)

Meitnerium (unknown chemical properties)

Darmstadtium (unknown chemical properties)

Roentgenium (unknown chemical properties)

Copernicium (transition metal)

Nihonium (unknown chemical properties)

Flerovium (unknown chemical properties)

Moscovium (unknown chemical properties)

Livermorium (unknown chemical properties)

Tennessine (unknown chemical properties)

Oganesson (unknown chemical properties)
Ir

Mt

(Uht)
hassium ← meitnerium → darmstadtium
Atomic number (Z) 109
Group, period group 9, period 7
Block d-block
Element category unknown, but probably a transition metal[3][4]
Mass number 278
(unconfirmed: 282) (most stable isotope)
Electron configuration [Rn] 5f14 6d7 7s2 (calculated)[3][5]
Electrons per shell
2, 8, 18, 32, 32, 15, 2 (predicted)
Physical properties
Phase solid (predicted)[4]
Density near r.t. 37.4 g/cm3 (predicted)[3]
Atomic properties
Oxidation states 9, 8, 6, 4, 3, 1 ​(predicted)[3][6][7][8]
Ionization energies 1st: 800.8 kJ/mol
2nd: 1823.6 kJ/mol
3rd: 2904.2 kJ/mol
(more) (all estimated)[3]
Atomic radius empirical: 128 pm (predicted)[3][8]
Covalent radius 129 pm (estimated)[9]
Miscellanea
Crystal structure ​face-centered cubic (fcc)
Face-centered cubic crystal structure for meitnerium

(predicted)[4]
Magnetic ordering paramagnetic (predicted)[10]
CAS Number 54038-01-6
History
Naming after Lise Meitner
Discovery Gesellschaft für Schwerionenforschung (1982)
Main isotopes of meitnerium
Iso­tope Abun­dance Half-life Decay mode Pro­duct
282Mt[11] syn 67 s? α 278Bh
278Mt syn 4 s α 274Bh
276Mt syn 0.6 s α 272Bh
274Mt syn 0.4 s α 270Bh

Meitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds, although the unconfirmed meitnerium-282 may have a longer half-life of 67 seconds. The GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany, first created this element in 1982. It is named for Lise Meitner.

In the periodic table, meitnerium is a d-block transactinide element. It is a member of the 7th period and is placed in the group 9 elements, although no chemical experiments have yet been carried out to confirm that it behaves as the heavier homologue to iridium in group 9 as the seventh member of the 6d series of transition metals. Meitnerium is calculated to have similar properties to its lighter homologues, cobalt, rhodium, and iridium.

History
Meitnerium was named after the physicist Lise Meitner, one of the discoverers of nuclear fission.
Discovery

Meitnerium was first synthesized on August 29, 1982 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung) in Darmstadt.[12] The team bombarded a target of bismuth-209 with accelerated nuclei of iron-58 and detected a single atom of the isotope meitnerium-266:[13]

209
83Bi
+ 58
26Fe
→ 266
109Mt
+
n

This work was confirmed three years later at the Joint Institute for Nuclear Research at Dubna (then in the Soviet Union).[1

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