Periodic Table 
| Bohrium | Symbol | Bh
transition metal | | Atomic Number | 107 | Relative Atomic Mass
12C = 12.0000 | [ 272 ] | | Significant Atomic Mass | 274
Neutrons 16 7 | | Atomic Radius pm | 128 (?) | First Ionisation Energy
kJ mol -1 | 660 (?) | | Electronegativity | - | | Density kg m -3 | 37000 (est.) | | Molar Volume cm 3 | - | Thermal Conductivity
W m -1 K -1 | - | | Melting Point K | - | | Boiling Point K | - | | Number of Isotopes | 7 |  | 261 Bh 11.8 ms
262 Bh 8.0 ms
264 Bh 440 ms
266 Bh 1.7 s
267 Bh 17 s
271 Bh ?
272 Bh 9.6 s
| | Inner/outer Shells | | | Inner/outer Orbitals | | | Filling Orbital | | | | | Ground State Electron Configuration | | | Ground State Electron Configuration |  | | | Ground State Electron Configuration with
free Orbitals (n=11) |  | | | Ground State Electron Configuration with compressed Orbitals (n= 162) |  | | | | Singularity | | | | | | s | p | d | f | g | h | i | j | | 1 | 2 | | | | | | | | | 2 | 2 | 6 | | | | | | | | 3 | 2 | 6 | 10 | | | | | | | 4 | 2 | 6 | 10 | 14 | | | | | | 5 | 2 | 6 | 10 | 14 | 18 | | | | | 6 | 2 | 6 | 5 | 5 | 14 | 18 | 22 | | | | 7 | 2 | 6 | 10 | 14 | 18 | 22 | 26 | | | 8 | | | | | | | | |
| | | | Term Symbol | 6S 5/2 | | CAS Reg-ID: | 54037-14-8 | 
| In 1976 Soviet scientists at the Joint Institute for Nuclear Research in Dubna, Russia, U.S.S.R., announced that they had synthesized element 107 by bombarding a target of bismuth-209 with ions of chromium-54. The resultant collisions were reported to have produced an isotope of the element with a mass number of 261 and a half-life of 1-2 milliseconds.
The existence of the element was confirmed by West German physicists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung [GSI] in Darmstadt, Germany) .
First produced by P. Armbruster,
G. Münzenberg in 25. 02. 1981 (UNILAC)
|
5424Cr + 20983Bi → 262107Bh + 10n
| | Name derived from | Named after the Danish physicist, Niels Bohr
a synthetic element in Group VIIb of the periodic table. It is thought to be chemically similar to the rare metal rhenium.
The IUPAC adopted the name Bohrium with the symbol Bh for Element 107 in August 1997.
| | Obsolete Names | Unnilseptium, Uns
eka- rhenium
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