Bh
Bohrium
Element 107 · Transition metal
Bohrium (Bh)
Bohrium is a synthetic, radioactive element made at the GSI laboratory in Darmstadt.
- Transition metal
- Period 7
- Group 7
- d-block
- solid at room temperature
- ☢ Radioactive
Key properties
- Atomic mass
- [270]
- u
- Electron configuration
- [Rn] 5f14 6d5 7s2
- Melting point
- —
- Boiling point
- —
- Density
- 37.1 g/cm³
- Electronegativity
- —
- Atomic radius
- —
- 1st ionisation energy
- —
Superheavy elements have only been made a few atoms at a time. Most properties shown are theoretical predictions.
Compare with every element:Electronegativity chartAtomic radius chartIonisation energy chartDensity chart of the elementsMelting point chartElectron configuration chart
Did you know?
Notable facts about bohrium
- 01
It was made by fusing bismuth-209 with chromium-54 nuclei.
- 02
Bohrium oxychloride behaves like the rhenium compound, as group 7 predicts.
- 03
Only a few dozen atoms of bohrium have ever been observed.
Applications
What is bohrium used for?
- Research
History
Discovery & name origin
Atomic structure
Atomic properties
Atomic structure
Atomic properties
- Atomic number
- 107
- Atomic mass
- [270] u
- Group
- 7
- Period
- 7
- Block
- d-block
- Electron configuration
- [Rn] 5f14 6d5 7s2
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d5
- Electrons per shell
- 2, 8, 18, 32, 32, 13, 2
- Electronegativity (Pauling)
- —
- Electron affinity
- —
- Atomic radius (van der Waals)
- —
- Stable isotopes
- None — all isotopes are radioactive
Oxidation states
Highlighted: common oxidation states (+7, +5, +4, +3).
Physical
Physical properties & colour
Physical
Physical properties & colour
- State at 20 °C
- Solid (predicted)
- Melting point
- —
- Boiling point
- —
- Density
- 37.1 g/cm³
- Molar heat capacity
- —
- Appearance
- —
- CPK model colour
- Copied
The CPK colour is the convention used for this element’s atoms in molecular models.
FAQ
Bohrium questions
What is Bh on the periodic table?
Bh is the symbol for bohrium, element 107 on the periodic table. It sits in group 7, period 7, in the transition metal category, and has an atomic mass of [270].
What is the atomic number of bohrium?
Bohrium has atomic number 107, so every bohrium atom has 107 protons in its nucleus. Its symbol is Bh and its atomic mass is [270].
Who discovered bohrium?
Bohrium was discovered by Peter Armbruster and Gottfried Münzenberg in 1981 (Germany). The name comes from from Niels Bohr.
What is bohrium used for?
Bohrium is used for: research.
Is bohrium a metal?
Yes. Bohrium is a transition metal, one of the metallic elements.
What is the electron configuration of bohrium?
The electron configuration of bohrium is [Rn] 5f14 6d5 7s2 (predicted). Its 107 electrons are arranged in shells as 2, 8, 18, 32, 32, 13, 2.