Bohrium (Bh)
Transition metal · d-block · period 7 · group 7
Only atoms at a time.
Bohrium (symbol Bh) is chemical element number 107, a transition metal in group 7, period 7 of the periodic table. Its standard atomic weight is (270) and its electron configuration is [Rn] 5f14 6d5 7s2. Its state at room temperature is unknown, and it is radioactive. Named after Niels Bohr.
Properties
| Atomic number | 107 |
|---|---|
| Atomic mass | (270) |
| Category | Transition metal |
| Block | d-block |
| Group · Period | 7 · 7 |
| Electron configuration | [Rn] 5f14 6d5 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 13, 2 |
| State at 25 °C | unknown |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity (Pauling) | — |
| Radioactive | Yes — no stable isotope |
| Origin | synthetic |
| Discovered | 1981 · GSI Darmstadt |
Key facts about Bohrium
- Named after Niels Bohr.
- A 2000 experiment studied just six atoms of it as an oxide gas — and it behaved like rhenium.
- Made by firing chromium ions at a bismuth target.
- Most isotopes last well under a minute.
What Bohrium is used for
None — research only.
Where it sits in the periodic table
Bohrium is in group 7, period 7, of the d-block. Its electron configuration [Rn] 5f14 6d5 7s2 means its outermost shell holds 2 electrons, which is what places it here and explains much of its chemistry. See Bohrium on the interactive table →
Bohrium — frequently asked questions
What is Bohrium used for?
None — research only.
Is Bohrium radioactive?
Yes. Bohrium has no stable isotope, so every form of it is radioactive.
What is the electron configuration of Bohrium?
Bohrium has the electron configuration [Rn] 5f14 6d5 7s2, which is 2, 8, 18, 32, 32, 13, 2 electrons per shell.
What group and period is Bohrium in?
Bohrium is in group 7, period 7, in the d-block. Its outer shell holds 2 electrons.
Who discovered Bohrium?
Bohrium was discovered in 1981 by GSI Darmstadt.