Hassium - 108Hs: the essentials
- Name: hassium
- Symbol: Hs
- Atomic number: 108
- Relative atomic mass (Ar): [ 269 ] (longest lived isotope)
- Standard state: presumably a solid at 298 K
- Appearance: unknown, but probably metallic and silvery white or grey in appearance
- Classification: Metallic
- Group in periodic table: 8
- Group name: (none)
- Period in periodic table: 7
- Block in periodic table: d
- Shell structure: 18.104.22.168.32.14.2
- CAS Registry: 54037-57-9
Hassium atoms have 108 electrons and the shell structure is 22.214.171.124.32.14.2. The ground state electronic configuration of neutral hassium is [Rn].5f14.6d6.7s2 (a guess based upon that of osmium) and the term symbol of hassium is 5D4 (a guess based upon guessed electronic structure).
Hassium, is a synthetic element that is not present in the environment at all.
The interested reader should consult the on-line version of Creating Super Heavy Elements for a fascinating insight into research on "super-heavy" atoms.
Hassium: physical properties
- Density of solid: 28600 (predicted) kg m-3
- Molar volume: 10 (rough estimate based upon density estimate) cm3
- Thermal conductivity: (no data) W m‑1 K‑1
Hassium: heat properties
- Melting point: (no data) K
- Boiling point: (no data) K
- Enthalpy of fusion: 20.5 kJ mol-1
Hassium: atom sizes
- Atomic radius (empirical): (no data) pm
- Molecular single bond covalent radius: 134 (coordination number 4) ppm
- van der Waals radius: (no data) ppm
- Pauling electronegativity: (no data) (Pauling units)
- Allred Rochow electronegativity: (no data) (Pauling units)
- Mulliken-Jaffe electronegativity: (no data)
Hassium: orbital properties
- First ionisation energy: 733 (inferred) kJ mol‑1
- Second ionisation energy: 1760 kJ mol‑1
- Third ionisation energy: 2830 kJ mol‑1
- Universe: (no data) ppb by weight
- Crustal rocks: (no data) ppb by weight
- Human: (no data) ppb by weight
Hassium: crystal structure
Hassium: biological data
- Human abundance by weight: (no data) ppb by weight
Hassium has no biological role.
Reactions of hassium as the element with air, water, halogens, acids, and bases where known.
Hassium: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of hassium where known.
Hassium: compound properties
Bond strengths; lattice energies of hassium halides, hydrides, oxides (where known); and reduction potentials where known.
Hassium: historyHassium was discovered by Peter Armbruster, Gottfried Münzenber and their co-workers. in 1984 at Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany.. Origin of name: the origin of the name is the Latin word "Hassias" meaning "Hess", the German state..
Isolation: only a few atoms of element 108, hassium, have ever been made. The first atoms were made through a nuclear reaction involving fusion of an isotope of lead, 208Pb, with one of iron, 58Fe.
208Bi + 58Fe → 265Hs + 1n
Isolation of an observable quantity of hassium has never been achieved, and may well never be. This is because hassium decays very rapidly through the emission of α-particles.
Press release: http://www.gsi.de/portrait/Pressemeldungen/17052001_e.html