111
Rg
Roentgenium
(282)
28183232172
#111
Roentgenium
unknown· Solid·282 u
Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.
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Identity
- Symbol
- Rg
- Atomic Number
- 111
- Atomic Mass
- 282 u
- Category
- unknown
- Block
- d-block
- Period
- 7
- Group
- 11
- Year Discovered
- 1994 CE
- Discovered By
- Gesellschaft für Schwerionenforschung
- Named By
- Wilhelm Röntgen
Electrons
- Configuration
- *[Rn] 5f14 6d10 7s1
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9
- Shells
- 2, 8, 18, 32, 32, 17, 2
- Electronegativity
- n/a
- Electron Affinity
- 151
- Oxidation States
- 5, 3, 1, -1
Physical Properties
- State at
- Unknown
- Melting Point
- n/a
- Boiling Point
- n/a
- Density
- 28.7
- Crystal Structure
- n/a
- Magnetic Ordering
- n/a
Mechanical
Thermal & Electrical
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0