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Element Fact
Cesium is used in atomic clock. As in 1999, the best clock is accurate to a second in 20 million years.

Seaborgium, Sg

seaborgium sample

Atomic number: 106
Atomic mass: [266] (no stable nuclide)
Natural abundance: -
Isotopes: -

History and Production

Named after Glenn T. Seaborg (1912-1999), a chemist and nuclear physicist. It was discovered in 1974 by workers at Lawrence-Berkeley Laboratory and independently at the Joint Institute for Nuclear Research at Dubna, Russia. The Berkeley group used the Super-Heavy Ion Linear Accelerator as a source of 18O to bombard a target of 249Cf. 263Sg was reported to have produced, with a half-life of about 0.9 second. On the other hand, the Dubna team used heavy-ion cyclotron to produce 54Cr and bombarded on 207Pb and 208Pb. They reported 259Sg with a half-life of 7 ms has been produced. The IUPAC assigned the name seaborgium for the new element in 1997, in honor of Dr. Seaborg while he was still alive.

Physical Data

Only few atoms have been produced so far and the physical properties of the element remain largely unknown.

Interatomic distance: -
Melting point: n/a
Boiling point: n/a
Thermal conductivity/Wm-1K-1: n/a
Density/kgm-3: 35000 (est.)

Standard Thermodynamic Data (atomic gas)

Enthalpy of formation: -
Gibbs free energy of formation: -
Entropy: -
Heat capacity: -

Electronic data

Electronic configuration: Electronic configuration: [Rn] 5f14 6d4 7s2
Term symbol: 5D0
Electron affinity: -   Electronegativity (Pauline): -
Ionization energy (first, second, third): 730 (est.), -, - kJ/mol

Chemical properties

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