Bohrium: the essentials
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 suggest bohrium (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 of The Wonderful World of Atoms and Nuclei for a fascinating insight into research on "super-heavy" atoms.
Bohrium: historical information
Scientists from the USSR reported their production of an isotope of bohrium in 1976 and this work was substantiated by German workers later.
Bohrium around us Read more »
Bohrium has no biological role.
Bohrium is a synthetic element that is not present in the geosphere.
|Location||ppb by weight||ppb by atoms||Links|
|Universe||(no data)||(no data)|
|Crustal rocks||(no data)||(no data)|
|Human||(no data) ppb by weight||(no data) atoms relative to C = 1000000|
Physical properties Read more »
- Density of solid: 27200 (predicted) kg m-3
- Molar volume: |196| cm3
- Thermal conductivity: |206| W m‑1 K‑1
Heat properties Read more »
Crystal structure Read more »
The solid state structure of bohrium is: .
Bohrium: orbital properties Read more »
Bohrium atoms have 107 electrons and the shell structure is 188.8.131.52.32.13.2. The ground state electronic configuration of neutral Bohrium is [Rn].5f14.6d5.7s2 (a guess based upon that of rhenium) and the term symbol of Bohrium is 6S5/2 (a guess based upon guessed electronic structure).
- Pauling electronegativity: (no data) (Pauling units)
- First ionisation energy: (no data) kJ mol‑1
- Second ionisation energy: (no data) kJ mol‑1
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.
Bohrium isotopes Read more »