111 · Rg
Roentgenium
Produced at GSI in 1994. The name roentgenium adopted in 2004.
Identity
- Atomic number
- 111
- Symbol
- Rg
- Canonical name
- Roentgenium
- Category
- classification unsettled
- Group
- 11
- 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
- [282] 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 6d10 7s1
- Electrons per shell
- 2, 8, 18, 32, 32, 17, 2
- Standard state
- not established
- Density
- 28.7 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: 282
History
Roentgenium
Synthesis · confirmed · 1994
GSI produces element 111 in the same year as element 110.
- Reaction
- 209Bi(64Ni,n)272Rg
- Target
- 209Bi
- Projectile
- 64Ni
- Isotope produced
- 272Rg
The name roentgenium
Official recognition · officially recognized · 2004
IUPAC adopts the name roentgenium in 2004.
Etymology
- Theme
- scientist
- Language
- allemand
- Root
- Röntgen
- Meaning
- Wilhelm Röntgen
- Temporary systematic name
- unununium (Uuu)
- Official adoption
- 2004
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)