106 · Sg
Seaborgium
Produced at Berkeley and Livermore in 1974. The name seaborgium adopted in 1997.
Identity
- Atomic number
- 106
- Symbol
- Sg
- Canonical name
- Seaborgium
- Category
- transition metal
- Group
- 6
- 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 6d4 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 12, 2
- Standard state
- not established
- Density
- 35 g/cm³ (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
Seaborgium
Synthesis · confirmed · 1974
The Berkeley and Livermore team produces element 106. A parallel Dubna claim does not carry priority.
- Target
- 249Cf
- Projectile
- 18O
The name seaborgium
Official recognition · officially recognized · 1997
The name seaborgium, for a time disputed because Seaborg was alive, is adopted in 1997.
Etymology
- Theme
- scientist
- Language
- anglais
- Root
- Seaborg
- Meaning
- Glenn Seaborg
- Temporary systematic name
- unnilhexium (Unh)
- Official adoption
- 1997
Scientists
Places and institutions
- Berkeley — historical setting : United States — present country : United States
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)