Hassium

Hassium is a very radioactive and unstable chemical element. It has the symbol Hs and it has the atomic number 108. It is a superheavy transuranium element.

Hassium is a radioactive element that does not exist in nature. It has to be made in a lab.

History

Hassium was first made in 1984. and eka-osmium. It was made at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany. The element was named from the Latin name for the German state of Hessen. Hessen is the state that the Gesellschaft für Schwerionenforschung is in. Before it was named Hassium, scientists could not decide what the name should be and there was an element naming controversy. The temporary IUPAC systematic element name was unniloctium meaning "one-zero-eight-ium" referring to its atomic number. The symbol with the name was Uno. In 1994 a committee of IUPAC recommended that element 108 be named hahnium. The name hassium was adopted internationally in 1997.

Chemistry

Isotope 270 of Hassium was found in December 2006. An international team of scientists led by the Technical University of Munich discovered it. It is a doubly magic isotope and it has a long half-life of 22 seconds. Scientists had thought that heavy and stable isotopes should exist. Some theories said Hassium-270 may be part of an island of stability. Hassium can oxidise like osmium, the element above it in the periodic table, into hassium tetroxide. Chemists found that is less volatile than osmium tetroxide.

Hassium Media

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  Scheme of an apparatus for creating superheavy elements, based on the Dubna Gas-Filled Recoil Separator set up in the Flerov Laboratory of Nuclear Reactions in JINR. The trajectory within the detector and the beam focusing apparatus changes because of a dipole magnet in the former and quadrupole magnets in the latter.

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  GSI, Darmstadt, Juli 2015 (4)

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  Coat of arms of the German state of Hesse, after which hassium is named after

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  Mineral molybdenite, chemical composition: MoS2, from collection of National Museum, Prague, Czech Republic, originally from New South Wales

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  Energy levels of outermost orbitals of hassium and osmium atoms in electronvolts, with and without taking relativistic effects into account. Note the lack of spin–orbit splitting (and thus the lack of distinction between d3/2 and d5/2 orbitals) in nonrelativistic calculations.

Other websites

• WebElements.com - Hassium
• Apsidium - Hs Archived 2007-01-03 at the Wayback Machine