Element Name: Bohrium (formerly Nielsbohrium)
Atomic Number: 107
Symbol: Bh
Atomic Weight: [264]
Discovery: Dubna (Russia) 1975 or Heavy Ion Research Lab (Germany) 1976
Electron Configuration: [Rn] 7s2 5f14 6d5
Word Origin: Formerly Ns, Nielsbohrium. Named in honor of Niels Bohr.
Sources: Bohrium is a man-made element. In 1976, Soviet scientists at Dubna announced they had synthesized element 107 by bombarding Bi-204 with heavy nuclei of Cr-54. There are reports that the element was ‘glimpsed’ for 2/1000 s in 1975. Bohrium was produced by bombarding a rapidly rotating cylinder target, coated with a thin layer of bismuth metal, with a stream of tangentially fired Cr-54 ions. West German physicists at the Heavy Ion Research Laboratory at Darmstadt verified the existence of element 107, creating and identifying six nuclei of Bohrium.
Element Classification: Transition Metal
Appearance: radioactive synthetic metal
References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange’s Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)