Element 107 · Transition metal
Bohrium (Bh) — Element 107
Niels Bohr
Bohrium (Bh) is a transition metal in Period 7, Group 7 of the periodic table with atomic number 107, standard atomic weight [270] u, and ground-state electron configuration [Rn] 5f¹⁴ 6d⁵ 7s². At standard temperature and pressure it is classified as a short-lived synthetic nuclide with 7 valence electrons and common oxidation states +7.
Research only
What are the atomic properties and physical constants of Bohrium?
Reference constants compiled from IUPAC standard atomic weights, the NIST Atomic Spectra Database, and the CRC Handbook.
- Atomic number (Z)
- 107
- Standard atomic mass
- [270] u
- Chemical family
- Transition metal
- Ground-state configuration
- [Rn] 5f¹⁴ 6d⁵ 7s²
- Electrons per shell
- 2, 8, 18, 32, 32, 13, 2
- Valence electrons
- 7
- Common ion charges / oxidation states
- +7
- Phase at STP
- Synthetic
- Pauling electronegativity
- —
- First ionization energy
- —
- Atomic radius
- —
- Melting point
- —
- Boiling point
- —
- Discovery year
- 1981
- Table coordinate
- Period 7, Group 7
- Radioactivity
- Radioactive (no stable isotopes)
How are electrons arranged across Bohrium’s shells?
A neutral Bohrium atom contains 107 electrons distributed across 7 occupied principal energy shells ([Rn] 5f¹⁴ 6d⁵ 7s²). The table below compares Bohrium’s shell occupancy against each shell’s theoretical 2n² capacity.
| Principal Shell (n) | Spectroscopic Letter | Electrons in Bh | Max Shell Capacity (2n²) |
|---|---|---|---|
| n = 1 | K | 2 e⁻ | 2 e⁻ |
| n = 2 | L | 8 e⁻ | 8 e⁻ |
| n = 3 | M | 18 e⁻ | 18 e⁻ |
| n = 4 | N | 32 e⁻ | 32 e⁻ |
| n = 5 | O | 32 e⁻ | 50 e⁻ |
| n = 6 | P | 13 e⁻ | 72 e⁻ |
| n = 7 | Q | 2 e⁻ | 98 e⁻ |
Frequently Asked Questions about Bohrium (Bh)
What is the atomic mass and atomic number of Bohrium (Bh)?
Bohrium (Bh) has atomic number Z = 107 (107 protons in its nucleus) and an IUPAC standard atomic weight of [270] u. It sits in Period 7, Group 7 and is classified as a transition metal.
What is the ground-state electron configuration of Bohrium?
The neutral ground-state electron configuration of Bohrium (Z = 107) is [Rn] 5f¹⁴ 6d⁵ 7s². Across its 7 occupied principal shells (n = 1 to n = 7), the electrons per shell are 2, 8, 18, 32, 32, 13, 2, with 7 valence electrons participating in bonding.
What are the common ion charges and electronegativity of Bohrium?
Bohrium commonly forms +7 oxidation states or ion charges in compounds. Its Pauling electronegativity is — and its first ionization energy is —.
When was Bohrium discovered and what is it used for?
Bohrium was discovered in 1981 (Niels Bohr). Research only
How does Bohrium compare to neighboring elements?
Other transition metal elements: