Bohrium

Atomic number

107

Atomic mass (u)

270.133

Category

Transition metal

Standard state

Solid

Melting point

Not reported

Boiling point

Not reported

Density (g/cm³)

Not reported in this source

Electronegativity (Pauling)

Not reported in this source

Electron configuration

[Rn]7s2 5f14 6d5

Oxidation states

7, 5, 4, 3

Atomic radius (pm)

Not reported in this source

First ionization energy (eV)

Not reported in this source

Discovery & recognition

Discovery year / period (PubChem)

1976

Discovery credited to (RSC)

Peter Armbruster, Gottfried Münzenberg and colleagues

Date or period recorded by RSC

1981

Discovery place

GSI, Germany (recognised discovery); earlier work at Dubna, Russia

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

This transuranium element is primarily produced through nuclear reactions in reactors or particle accelerators. Some transuranium elements also occur naturally in extremely small traces; that is different from a mineable deposit.

“Bohrium does not occur naturally and only a few atoms have ever been made.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.