108 · Hs
Hassium
Produced at GSI in 1984. Name adopted in 1997.
Identity
- Atomic number
- 108
- Symbol
- Hs
- Canonical name
- Hassium
- Category
- transition metal
- Group
- 8
- Period
- 7
- Block
- d
Bulk chemistry is not established. The table column is not a confirmed family.
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- [269] No standard atomic weight. The number shown is the conventional mass number used in tables, not a measured mass in u.
- Electron configuration
- *[Rn] 5f14 6d6 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 14, 2
- Standard state
- not established
- Density
- 40.7 g/cm³ (estimated) Predicted value: the element has not been observed in bulk.
- Melting point
- 126 K (estimated) Predicted value: the element has not been observed in bulk.
Notable isotopes
This summary is not an inventory of every isotope.
Conventional mass number: 269
History
Hassium
Synthesis · confirmed · 1984
GSI produces element 108.
- Reaction
- 208Pb(58Fe,n)265Hs
- Target
- 208Pb
- Projectile
- 58Fe
- Isotope produced
- 265Hs
The name hassium
Official recognition · officially recognized · 1997
IUPAC adopts the name hassium in 1997.
Etymology
- Theme
- place
- Language
- latin
- Root
- Hassia
- Meaning
- Hesse
- Temporary systematic name
- unniloctium (Uno)
- Official adoption
- 1997
Scientists
Places and institutions
- Darmstadt — historical setting : Germany — present country : Germany
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- IUPAC, décisions sur la priorité et les noms des éléments transfermiens (1997–2016)