| Atomic Mass | 270 |
|---|---|
| Electron Configuration | [Rn]7s25f146d5 |
| Oxidation States | 7, (5), (4), (3) (parenthesized oxidation states are predictions) |
| Year Discovered | 1976 |
| Atomic Mass | 270 |
|---|---|
| Electron Configuration | [Rn]7s25f146d5 |
| Oxidation States | 7, (5), (4), (3) (parenthes |
| Year Discovered | 1976 |
| Element Name | Bohrium |
|---|---|
| Element Symbol | Bh |
| InChI | InChI=1S/Bh |
| InChIKey | INOXRQQPOOCQPH-UHFFFAOYSA-N |
| Atomic Weight |
270 270 Relative Mass: 272.13826(58#) |
|---|---|
| Electron Configuration |
[Rn]7s25f146d5 |
| Atomic Radius |
Empirical Atomic Radius : empirical: 128 pm (predicted) |
| Oxidation States |
7, (5), (4), (3) (parenthesized oxidation states are predictions) |
| Ground Level |
5/2 |
| Ionization Energy |
7.7 ± 0.5 eV (The level was determined by interpolation or extrapolation of known experimental values or by semiempirical calculation; its absolutre accuracy is reflected in the number of significant figures assigned to it.) |
| Atomic Spectra |
Levels Holdings |
| Physical Description |
Solid |
| Element Classification |
Metal |
| Element Period Number |
7 |
| Element Group Number |
7 |
| Estimated Crustal Abundance |
Not Applicable |
| Estimated Oceanic Abundance |
Not Applicable |
First produced in 1976 by scientists working at the Joint Institute for Nuclear Research in Dubna, Russia, and later confirmed in 1981 by Peter Armbruster, Gottfried Münzenber and their team working at the Gesellschaft für Schwerionenforschung in Darmstadt, Germany, bohrium was produced by bombarding a target of bismuth-209 with ions of chromium-54. Bohrium's most stable isotope, bohrium-270, has a half-life of about 1 minute. It decays into dubnium-266 through alpha decay.
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.
Bohrium does not occur naturally in the Earth’s crust. Bohrium was first synthesized by German scientists at the GSI Center for Heavy Ion Research in Darmstadt, Germany in 1981 using the nuclear reaction 209Bi (54Cr, n) 262Bh. The element is named for Niels Bohr (Fig. IUPAC.107.1), the Nobel Prize winning physicist [649], [650]. Bohrium has no known isotopic applications aside from scientific research.
Bohrium is named after Niels Bohr.
Since only a few atoms of bohrium have ever been made, there are currently no uses for bohrium outside of basic scientific research.
See more information at the Bohrium compound page.
| CID | Name | Formula | SMILES | Molecular Weight |
|---|---|---|---|---|
| 56951713 | bohrium | Bh | [Bh] | 270.133 |
| Stable Isotope Count | 0 |
|---|
| Isotope | Atomic Mass (uncertainty) [u] | Abundance (uncertainty) |
|---|---|---|
| 272Bh | 272.13826(58#) |
| Nuclide | Atomic Mass and Uncertainty [u] | Half Life and Uncertainty | Discovery Year | Decay Modes, Intensities and Uncertainties [%] |
|---|---|---|---|---|
| 260Bh | 260.121443 ± 0.000211 [Estimated] | 41 ms ± 14 | 2008 | α≈100%; β+ ?; SF ? |
| 261Bh | 261.121395733 ± 0.000193026 | 12.8 ms ± 3.2 | 1989 | α≈100%; SF ? |
| 262Bh | 262.122654688 ± 0.000099919 | 84 ms ± 11 | 1981 | α≈100%; SF<20% |
| 262Bhm | 262.122654688 ± 0.000099919 | 9.5 ms ± 1.6 | 1981 | α≈100%; SF ? |
| 263Bh | 263.122916 ± 0.000328 [Estimated] | 200 ms [Estimated] | α ? | |
| 264Bh | 264.124486 ± 0.00019 [Estimated] | 1.07 s ± 0.21 | 1995 | α≈86%; SF≈14%; β+ ? |
| 264Bhp | 264.124486 ± 0.00019 [Estimated] | Not-specified | ||
| 265Bh | 265.124955 ± 0.000257 [Estimated] | 1.19 s ± 0.52 | 2004 | α=? |
| 266Bh | 266.126790 ± 0.000175 [Estimated] | 10.6 s ± 2.2 | 2000 | α≈100%; β+ ?; SF ? |
| 267Bh | 267.127499 ± 0.000282 [Estimated] | 22 s ± 10 | 2000 | α=100% |
| 268Bh | 268.129584 ± 0.00041 [Estimated] | 190 s [Estimated] | α ?; SF ? | |
| 269Bh | 269.130411 ± 0.000402 [Estimated] | 1 m [Estimated] | α ? | |
| 270Bh | 270.133366 ± 0.00032 [Estimated] | 3.8 m ± 3.0 | 2007 | α=100% |
| 271Bh | 271.135115 ± 0.000412 [Estimated] | 2.9 s ± 1.9 | 2013 | α=100% |
| 272Bh | 272.138259 ± 0.000571 [Estimated] | 11.3 s ± 1.8 | 2004 | α≈100% |
| 273Bh | 273.140294 ± 0.000703 [Estimated] | 1 m [Estimated] | α ?; SF ? | |
| 274Bh | 274.143599 ± 0.00062 [Estimated] | 57 s ± 27 | 2010 | α=100% |
| 275Bh | 275.145766 ± 0.000644 [Estimated] | 1 m [Estimated] | SF ? | |
| 276Bh | 276.149169 ± 0.000644 [Estimated] | 60 s [Estimated] | α ?; SF ? | |
| 277Bh | 277.151477 ± 0.000644 [Estimated] | 10 s [Estimated] | α ?; SF ? | |
| 278Bh | 278.154988 ± 0.000429 [Estimated] | 2 s [Estimated] | 2016 | SF≈100%; α ? |
