Bohrium

Bohrium is the superheavy element with atomic number 107, first synthesized in 1981 by a team at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany, that bombarded a bismuth target with chromium ions; it is named after the nuclear physicist Niels Bohr. All of its isotopes have half-lives on the millisecond-to-second scale, it does not occur in nature, and only a few atoms are obtained in each synthesis. It has no practical uses and serves only in research on the nucleosynthesis and chemical behavior of superheavy elements.

Bohrium compounds such as bohrium oxychloride (BhO3Cl) have only been tentatively studied in very brief single-atom chemistry experiments, to infer whether it behaves like rhenium; they have never been prepared or weighed in macroscopic quantities and have no scale of application.