| Hassium - Hs
CAS: 54037-57-9 Description: Classification: Transactinide Date of Discovery: 1984 Discoverer: Peter Armbruster, Gottfried Munzenber and others Name Origin: Latin Hassias, a German state. Other Names: Unniloctium (Uno), Hahnium (Hn) |
|
|
Atomic Number: 108
Number of Neutrons: 157 Atomic Mass: (265) amu Melting Point: Boiling Point: Density (293 K): Atomic volume: Electrical resistivity: Thermal conductivity: Enthalpy of atomization: Enthalpy of vaporization: Enthalpy of fusion: Specific heat capacity: |
Energy levels: 2-8-18-32-32-14-2
Electron configuration: [Rn]5f 146d67s2 Crystal Structure: Atomic radius: Covalent radius: Oxidation States: Electronegativity, Pauling: Electron affinity: First ionization energy: 2nd ionization energy: 3rd ionization energy: Polarizability: |
| Isotope | Atomic Mass | Half-life | Decay Mode | Spin |
| 263Hs |  |
|||
| 264Hs | 264.1286 |  0.08 ms |
, SF |
|
| 265Hs | 265.1306 | 2 ms | |
|
|
Element 108 was first synthesized and identified in 1984 by the same G.S.I. Darmstadt group who first identified Elements 107 and 109. Presumably this element will have chemical properties similar to osmium. Isotope 265108 was produced using a beam of 58Fe projectiles produced by the Universal Linear Accelerator (UNILAC) to bombard a 208Pb target. Discovery of Elements 107 and 109 was made using detection of isotopes with odd proton and neutron numbers. Elements having even atomic numbers are thought to be less stable against spontaneous fusion than odd elements. The production of 265108 in the same reaction as was used at G.S.I. was confirmed at Dubna with detection of the 7th member of the decay chain 253Es. Isotopes of Element 108 were believed to decay by spontaneous fission, explaining why 109 was produced before 108. Isotope 265108 and 266-108 are thought to decay to
261106, which in turn decays to 257104 and 253No. The IUPAC recommend[ed] the name hahnium (Hn), honoring Otto Hahn, for this element; however, Element 105 has already been referred to as hahnium for many years.
LINKS: Return
Sources for the information on this website include: Lide, David R., ed. CRC Handbook of Chemistry and Physics, 78th Ed., 1997-1998. |
||||