Seaborgium

Seaborgium [Sg]  | |
CAS-ID: 54038-81-2 | |
An: 106 N: 160 | |
Am: [266] g/mol | |
Group No: 6 | |
Group Name: Transactinides |
Block: d-block  Period: 7 |
State: Metallic |
Colour: unknown, but probably metallic and silvery white or grey in appearance Classification:  |
Boiling Point: unknown |
Melting Point: unknown |
Density: unknown |
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DiscoveryInformation |
Who: members of the Joint Institute for Nuclear Research, workers of the Lawrence Berkeley and Livermore Laboratories |
When: 1974 |
Where: Dubna, USSR / Berkeley California |
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Name Origin |
For Glenn Seaborg, part of the Dubna group that first synthesized this element. |
 "Seaborgium" in different languages. |
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Sources |
Seaborgium is a synthetic elementthat is not present in the environment at all. |
The first samples were made by fusing 249Cf with 18O. |
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Uses |
None. |
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History |
Element 106 was discovered almost simultaneously by two different laboratories. In June 1974, an American research team led by Albert Ghiorso at the Lawrence Radiation Laboratory at the University of California, Berkeley reported creating anisotope with mass number 263 and a half-life of 1.0 s, and in September 1974, a Soviet team led by G. N. Flerov at the Joint Institute for Nuclear Research at Dubna reported producing an isotope with mass number 259 and a half-life of 0.48 s. |
Because their work was independently confirmed first, the Americans suggested the name seaborgium to honor the American chemist Glenn T. Seaborgcredited as a member of the American team along with Ghiorso, J. M. Nitschke, J. R. Alonso, C. T. Alonso, M. Nurmia, E. Kenneth Hulet, and R. W. Lougheed in recognition of his participation in the discovery of several other actinoids. The name selected by the team became controversial. An international committee decided in 1992 that the Berkeley and Dubna laboratories should share credit for thediscovery. |
An element naming controversy erupted and as a result IUPAC adopted unnilhexium as a temporary, systematic element name. In 1994 a committee of IUPAC recommended that element 106 be named rutherfordium and adopted a rule that no element can be named after a living person. This ruling was fiercely objected to by the American Chemical Society. Critics pointed out that a precedent had beenset in the naming of einsteinium during Albert Einstein's life. In 1997, as part of a compromise involving elements 104 to 108, the name seaborgium for element 106 was recognized internationally. |
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Notes |
In August of 1997 the International Union of Pure and Applied Chemistry announced the official naming of this element as Seaborgium. |
Element 106 was previously known as Unnilhexium;from the latin for "one zero six". |

Seaborgium |
Electrons per shell | 2,8,18,32,32,12,2 |
Electron Configuration | [Rn] 5f14 6d4 7s2  |
Ground state | |
Atomic Volume | cm3 mol-1 |
Electronegativity | No data. |
Magnetic ordering | No data |

Thermal Properties |
Enthalpy of Atomization | No data. |
Enthalpy of Fusion | No data. |
Enthalpy of Vaporisation | No data. |Heat Capacity | No data. |
Thermal Conductivity | No data. |
Thermal Expansion | No data. |

Electrical Properties |
Electrical resistivity | No data. |
Electrical conductivity | ? 106/cm Ω |

Atomic Radii |
Empirical | No data. |
Bohr Radius | No data. |
Covalent Radius | No data. |
Van der Waals | No data. |
Triple covalent | 121 pm |
Metallic | No data. |
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Oxidation States |
Main | Sg+6 (predicted as most stable) |
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Other | |
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Ionisation Energies (kJ mol-1)  |
M - M+ | 730 (est.) |
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There are 11 known isotopes of Seaborgium, the longest-lived isotope is 269Sg which decays through alpha decay and spontaneous fission. It has a half-llife of 22 seconds. |
The shortest-lived isotope is 258Sg which also...