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Proposed Name | Atomic Number: | 106 | Atomic Symbol: | Sg | | Atomic Weight: | 263 | Electron Configuration: | 2-8-18-32-12-2 | | Shells: | 2,8,18,32,32,12,2 | Filling Orbital: | 6d4 | | Melting Point: | 700oC | Boiling Point: | 1737oC | | Description: | Man made radioactive metal. |
HistoryIn June 1974, members of the Joint Institute for Nuclear
Research in Dubna, U.S.S.R., reported their discovery of Element 106, which they
reported to have synthesized. In September 1974, workers of the Lawrence
Berkeley and Livermore Laboratories also claimed creation Element 106 "without
any scientific doubt." The LBL and LLL Group used the Super HILAC to accelerate
18O ions onto a 249Cf target.
ElementsElement 106 was created by the reaction 249Cf(18O, 4N)263X,
which decayed by alpha emission to rutherfordium, and then
by alpha emission to nobelium, which in turn further
decayed by alpha between daughter and granddaughter. The element so identified
had alpha energies of 9.06 and 9.25 MeV with a half-life of 0.9 +/- 0.2 s.
UsesAt Dubna, 280-MeV ions of 54Cr from the 310-cm cyclotron were used
to strike targets of 206Pb, 207Pb, and 208Pb, in separate runs. Foils exposed to
a rotating target disc were used to detect spontaneous fission activities. The
foils were etched and examined microscopically to detect the number of fission
tracks and the half-life of the fission activity.
Other experiments were made to aid in confirmation of the discovery. Neither
the Dubna team nore the Berkeley-Livermore Group has proposed a name as yet for
element 106 (unnilhexium).
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