Element 107
Bohrium (Bh)
Bohrium (Bh) is element 107 of the periodic table, a transition metal in period 7, group 7 (d-block) with an atomic mass of 270 and is a solid at standard conditions.
At a glance
- Atomic number
- 107
- Symbol
- Bh
- Atomic mass
- 270 u
- Category
- Transition metals
- Period
- 7
- Group
- 7
- Block
- d-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d5 7s2
- Shorthand configuration
- [Rn] 5f14 6d5 7s2
- Electrons per shell
- 2, 8, 18, 32, 32, 13, 2
- Oxidation states
- +7
Physical properties
Bohrium has only ever been produced in quantities too small to weigh or observe in bulk. The physical and atomic values below are theoretical predictions from periodic trends and relativistic calculations, not measurements.
- Density
- 37.1 g/cm³ (predicted)
- Phase
- solid
Atomic properties
- Covalent radius
- 141 pm (predicted)
- First ionization energy
- 740 kJ/mol (predicted)
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Bh-270 | 270.13336 | - | Half-life 61 seconds |
Common uses
- Scientific research only
Discovery
- Year
- 1981
- Discovered by
- Peter Armbruster, Gottfried Münzenberg
- Country
- Germany
Frequently asked questions
- Is bohrium a metal?
- Yes. Bohrium is a metal, classified as a transition metal on the periodic table.
- How many protons does bohrium have?
- Bohrium has 107 protons. Its atomic number is 107, which is also the number of electrons in a neutral atom of bohrium.
- What group and period is bohrium in?
- Bohrium is in group 7 and period 7 of the periodic table, in the d-block.
- What is the atomic mass of bohrium?
- The atomic mass of bohrium is 270 u (unified atomic mass units).
Keep exploring
Bohrium's row is on the printable element property sheet, and its tile is on the periodic table wall chart - the same numbers as above, laid out for A4 or A3 paper.