Hassium does not occur naturally in the Earth’s crust. Hassium was first synthesized by German
scientists at the GSI Center for Heavy Ion Research in Darmstadt, Germany in 1984 using the
nuclear reaction
208
Pb (
58
Fe, n)
265
Hs (Figure 1). The
element
is named for Hassia (the Latin
name for the German state of Hesse), whose former capital was Darmstadt [662-664]. Hassium is
used in chemical and heavy element research.
Stable
isotope
Relative
atomic mass
Mole
fraction
(none)
Fig. 1: GSI Helmholtz Centre for Heavy
Ion Research in Darmstadt, Germany. (Photographer:
A. Zschau. Used with permission from: GSI Helmholtzzentrum für Schwerionenforschung)
[665].
Glossary
atomic number (Z) – The number of protons in the nucleus of an atom.
electron – elementary particle of matter with a negative electric charge and a rest mass of about
9.109 × 10
–31
kg.
element (chemical element) – a species of atoms; all atoms with the same number of protons in
the atomic nucleus. A pure chemical substance composed of atoms with the same number of
protons in the atomic nucleus [703].
[return]
neutron – an elementary particle with no net charge and a rest mass of about 1.675 × 10
–27
kg,
slightly more than that of the proton. All atoms contain neutrons in their nucleus except for
protium (
1
H).
proton – an elementary particle having a rest mass of about 1.673 × 10
–27
kg, slightly less than
that of a neutron, and a positive electric charge equal and opposite to that of the electron. The
number of protons in the nucleus of an atom is the atomic number.
References
662.
P. Preuss.
Hassium becomes heaviest element to have its chemistry studied. Berkeley
Lab. 2014 Feb. 25.
http://www.lbl.gov/Science-Articles/Archive/108-chemistry.html
663.
S. E. a. J. Lab.
It's Elemental - The Element Hassium. Science Education at Jefferson
Lab. 2014 Feb. 25.
http://education.jlab.org/itselemental/ele108.html
664.
W. Loveland, and Robert, A. M. In
Encyclopedia of Physical Science and Technology,
pp. 597. Academic Press, New York (2001).
665.
A. Zschau. Gallery- GSI in General- Aerial Views. GSI Helmholtzzentrum für
Schwerionenforschung GmbH. 2014 Feb. 25.
https://www.gsi.de/en/presse_medien/mediathek/gallery.htm#c4447
703.
I. U. o. P. a. A. Chemistry.
Compendium of Chemical Terminology, 2nd ed. (the "Gold
Book"). Blackwell Scientific Publications, Oxford (1997).