111
Rg
281
Roentgenium
Unknown
Group 11
Period 7
Block d
Roentgenium is a chemical element of the periodic table with chemical symbol Rg and atomic number 111 with an atomic weight of 281 u and is classed as unknown and is part of group 11 (coinage metals). Roentgenium is solid at room temperature.
Roentgenium in the periodic table
| Symbol | Rg |
| Atomic number | 111 |
| Group | 11 (Coinage metals) |
| Period | 7 |
| Block | d |
| Classification | Unknown |
| Appearance | - |
| Color | - |
| Number of protons | 111 p+ |
| Number of neutrons | 170 n0 |
| Number of electrons | 111 e- |
From Wikipedia, the free encyclopediaRoentgenium 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.
Physical properties
| Phase at STP | Solid |
| Density | 28.7 g/cm3 |
| Atomic weight | 281 u |
Thermal properties
Atomic properties
| Electronegativity (Pauling Scale) | - |
| Electron affinity | 151 kJ/mol |
| Oxidation states | (−1), (+1), (+3), (+5), (+7) (predicted) |
| Ionization energies |
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Electron configuration for roentgenium
Electron configuration Shorthand configuration | [Rn] 5f14 6d9 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Full configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d9 7s2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Electron configuration chart |
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| Electrons per shell | 2, 8, 18, 32, 32, 17, 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valence electrons | 11 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Valency electrons | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bohr model | Figure: Shell diagram of Roentgenium (Rg) atom. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Orbital Diagram
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The history of Roentgenium
| Discovery | Gesellschaft für Schwerionenforschung (1994) |
| Named by | GSI |
Discovery of roentgenium Roentgenium was first synthesized in December 1994 at GSI in Darmstadt by the team of Sigurd Hofmann using cold fusion of nickel-64 ions with bismuth-209. The element was named in honour of Wilhelm Conrad Röntgen, the German physicist who discovered X-rays in 1895 and received the first ever Nobel Prize in Physics in 1901. | |
| Original word | Röntgen |
| Language of origin | English |
| Name source | Person |
| Meaning | “Wilhelm Röntgen” |
Naming The element is named in honour of Wilhelm Conrad Roentgen, the German physicist who discovered X-rays in 1895. | |
Identifiers
List of unique identifiers for Roentgenium in various chemical registry databases| CAS Number | 54386-24-2 |
| ChemSpider ID | - |
| EC number | - |
| PubChem CID Number | 135476786 |