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Bohrium is named after Niels Bohr. |
Bohrium
| Atomic Number: | 107 | Atomic Radius: | empirical: 128 pm (predicted)[2] |
| Atomic Symbol: | Bh | Melting Point: | -- |
| Atomic Weight: | 270 | Boiling Point: | -- |
| Electron Configuration: | [Rn]7s2[1][2]5f146d5 | Oxidation States: | 7, (5), (4), (3)[2][4] (parenthesized oxidation states are predictions) |
History
Formally known as Ns, Nielsbohrium
In 1976 Soviet scientists at Dubna announced they had synthesized element 107 by bombarding 204Bi with heavy nuclei of 54Cr. Reports say that experiments in 1975 had allowed scientists "to glimpse" the new element for 2/1000 s. A rapidly rotating cylinder, coated with a thin layer of bismuth metal, was used as a target. This was bombarded by a stream of 54Cr ions fired tangentially.
The existence of element 107 was confirmed by a team of West German physicists at the Heavy Ion Research Laboratory at Darmstadt, who created and identified six nuclei of element 107.