Bohrium is a synthetic element that is not present in the environment at all. The German discoverers at GSI proposed the name Nielsbohrium (symbol Ns) after Niels Bohr. IUPAC are happy to name an element after Bohr but suggestbohrium (Bh) on the grounds that the first name of a person does not appear in the names of any other element named after a person. This seems to have been accepted by all concerned.
The interested reader should consult the on-line version ofCreating Super Heavy Elements for a fascinating insight into research on "super-heavy" atoms.
Bohrium wasdiscovered by Peter Armbruster, Gottfried Münzenber and their co-workers. in 1981 at Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany..Origin of name: the origin of the name is Niels "Bohr", the Danish physicist..
Isolation: only a few atoms of element 107, bohrium, have ever been made. The first atoms were made through a nuclear reaction involving fusion of an isotope of lead,209Pb, with one of chromium,54Cr.
209Pb +54Cr →262Bh +1n
Isolation of an observable quantity of bohrium has never been achieved, and may well never be. This is because bohrium decays very rapidly through the emission of α-particles.
More recently, other isotopes have been made at the Paul Scherrer Institute (PSI) in Switzerland.
249Bk +22Ne →266Bh + 51n
249Bk +22Ne →267Bh + 41n
In this work, it appears the scientists concerned feel bohrium forms the oxychloride BhClO3.
Density of solid: 27200 (predicted) kg m-3
Molar volume: 10 (rough estimate based upon density estimate) cm3
Thermal conductivity: (no data) W m‑1 K‑1
Melting point: (no data) K
Boiling point: (no data) K
Enthalpy of fusion: 20.5 kJ mol-1
Atomic radius (empirical): (no data) pm
Molecular single bond covalent radius: 141 (coordination number 5) ppm
van der Waals radius: (no data) ppm
Pauling electronegativity: (no data) (Pauling units)
Allred Rochow electronegativity: (no data) (Pauling units)
Mulliken-Jaffe electronegativity: (no data)
First ionisation energy: 743 (inferred) kJ mol‑1
Second ionisation energy: 1690 kJ mol‑1
Third ionisation energy: 2580 kJ mol‑1
Universe: (no data) ppb by weight
Crustal rocks: (no data) ppb by weight
Human: (no data) ppb by weight
