Meitnerium Information
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Meitnerium Element
Meitnerium is a synthetic
chemical element with the symbol Mt and atomic number 109. It is an extremely
radioactive synthetic element (an element not found in nature, but can be
created in a laboratory). The most stable known isotope, meitnerium-278, has a
half-life of 4.5 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 after
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.
Meitnerium is a radioactive,
synthetic element about which little is known. It is classified as a metal and
is a solid at room temperature.
Meitnerium has seven isotopes
with known half-lives. The most stable is meitnerium-278 (278Mt), with a
half-life of about eight seconds. It decays into bohrium-274 (274Bh) through
alpha decay.
The atomic weight for manmade
transuranium elements is based on the longest-lived isotope. These atomic
weights should be considered provisional since a new isotope with a longer
half-life could be produced in the future. [See Periodic Table of the Elements]
Sources
of meitnerium
Meitnerium
is produced artificially. It can be made by bombarding atoms of bismuth-209
(209Bi) with ions of iron-58 (58Fe) using a linear accelerator. Armbruster and
Münzenber bombarded their target for a week in order to produce a fused
nucleus.
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