107
Bh
Bohrium
270
Bohrium (Bh)
Transition MetalGroup 7Period 7d-block-blockRadioactive
Bohrium is a chemical element with symbol Bh and atomic number 107. It is named after Danish physicist Niels Bohr. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 270Bh, has a half-life of approximately 61 seconds.
Latin name: Bohrium
Atomic Number
107
Atomic Mass
270 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 6d⁵ 7s²
General
SymbolBh
Atomic Number107
Atomic Mass270 g/mol
CategoryTransition Metal
Group7
Period7
Blockd-block
Electron Configuration[Rn] 5f¹⁴ 6d⁵ 7s²
Valence Electrons7
Colourmetallic (predicted)
Physical Properties
Phase (STP)Solid (predicted)
Density37 (predicted)
Melting Point2800 (predicted)
Boiling PointUnknown
Atomic Properties
Atomic Radius241 pm
Electronegativity1.3 Pauling
Oxidation States+7
Ion ChargeBh7+
Nuclear & Hazards
RadioactiveYes
Half-life61 seconds (Bh-270)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year1981
Discovered ByGesellschaft für Schwerionenforschung (GSI), Darmstadt
Country of DiscoveryGermany
Isotopes of Bohrium
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Bh-270 | — | 61 seconds | α |
| Bh-274 | — | ~40 seconds | α |