Bohrium - Bh General Information Discovery Bohrium was first made in 1981 by Peter Armbruster, Gottfried Munzenberg and co-workers at the GSI in Darmstadt, Germany. Appearance Unknown, but probably metallic grey in appearance. Source A transuranium element, only a few atoms of bohrium have ever been made, and it will probably never be isolated in observable quantities. Created by the so-called "cold fusion" method, in which a target of bismuth is bombarded with atoms of chromium. Uses Unknown Biological Role None General Information A synthetic element created via nuclear bombardment, few atoms have ever been made and the properties of bohrium are very poorly understood. It is a radioactive metal which does not occur naturally and is of research interest only. The first atoms were made via a nuclear reaction, the cold fusion method: 209Bi + 54Cr ®  262Bh + n

	Physical Information
	Atomic Number		107
	Relative Atomic Mass (12C=12.000)		262.12
	Melting Point/K		not available
	Boiling Point/K		not available
	Density/kg m-3		37,000 (estimated)
	Ground State Electron Configuration		[Rn]5f146d57s2
	Electron Affinity(M-M-)/kJ mol-1		not available

	Key Isotopes
	nuclide	261Bh	262Bh	262MBh
	atomic mass	262.12	262.12
	natural abundance	0%	0%	0%
	half-life	0.012 secs	0.1 secs	8x10-3 secs

Other Information
Enthalpy of Fusion/kJ mol-1		n/a
Enthalpy of Vaporisation/kJ mol-1		n/a
Oxidation States
Bh+7 has been predicted as probably the most stable state.

	Ionisation Energies/kJ mol-1
	M - M+	660 (est)
	M+ - M2+
	M2+ - M3+
	M3+ - M4+
	M4+ - M5+
	M5+ - M6+
	M6+ - M7+
	M7+ - M8+
	M8+ - M9+
	M9+ - M10+