Bohrium (symbol Bh, atomic number 107) is a synthetic superheavy element named after Niels Bohr. It is classified as a transition metal and sits in group 7, period 7 of the periodic table.
Overview
Bohrium is the chemical element with atomic number 107 and the symbol Bh. With a standard atomic weight of [270], it is a transition metal. In the periodic table it occupies group 7 and period 7, and under standard conditions it is normally a solid. Bohrium is a synthetic superheavy element named after Niels Bohr.
Atomic structure
An atom of Bohrium has 107 protons in its nucleus and, when neutral, 107 electrons arranged in the configuration [Rn] 5f14 6d5 7s2. Bohrium has no stable isotope; the value [270] refers to the mass number of its most stable or most commonly produced isotope.
Discovery and place in the table
Bohrium was discovered in 1981 by Gesellschaft für Schwerionenforschung. It follows Seaborgium (Sg) and precedes Hassium (Hs) in order of atomic number.
| Atomic number | 107 |
|---|---|
| Symbol | Bh |
| Atomic mass | [270] |
| Category | Transition metal |
| Group | 7 |
| Period | 7 |
| Electron configuration | [Rn] 5f14 6d5 7s2 |
| Phase at STP | Solid |
| Discovered | 1981 (Gesellschaft für Schwerionenforschung) |