hassium

hassium

[has-ee-uhm]
noun Chemistry, Physics.
a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Hs; atomic number: 108.
Formerly unniloctium, element 108.


Origin:
after Medieval Latin Hassia (the German state of Hesse, location of the institute where it was first created); see -ium

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World English Dictionary
hassium (ˈhæsɪəm)
 
n
a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Hs; atomic no: 108
 
[C20: from Latin, from Hesse, German state where it was discovered]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hassium   (hä'sē-əm)  Pronunciation Key 
Symbol Hs
A synthetic, radioactive element that is produced by bombarding lead with iron ions. Its most long-lived isotopes have mass numbers of 264 and 265 with half-lives of 0.08 millisecond and 2 milliseconds, respectively. Atomic number 108. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

hassium

an artificially produced element belonging to the transuranium group, atomic number 108. It was synthesized and identified in 1984 by West German researchers at the Institute for Heavy Ion Research (Gesellschaft fur Schwerionenforschung [GSI]) in Darmstadt. On the basis of its position in the periodic table of the elements, it is expected to have chemical properties similar to those of osmium.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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