107 · Bh
Bohrium
Produced at GSI in 1981. Name adopted in 1997.
Identity
- Atomic number
- 107
- Symbol
- Bh
- Canonical name
- Bohrium
- Category
- transition metal
- Group
- 7
- 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
- [270] 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 6d5 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 13, 2
- Standard state
- not established
- Density
- 37.1 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: 270
History
Bohrium at Darmstadt
Synthesis · confirmed · 1981
The GSI team produces element 107.
- Reaction
- 209Bi(54Cr,n)262Bh
- Target
- 209Bi
- Projectile
- 54Cr
- Isotope produced
- 262Bh
The name bohrium
Official recognition · officially recognized · 1997
IUPAC adopts the name bohrium in 1997.
Etymology
- Theme
- scientist
- Language
- danois
- Root
- Bohr
- Meaning
- Niels Bohr
- Temporary systematic name
- unnilseptium (Uns)
- 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)