107Bh[270]
Bohrium (Bh)
Element 107 Ā· Transition metal
Bohrium (Bh) is a chemical element with atomic number 107. It is classified as a transition metal in period 7, group 7 of the periodic table (the d-block). Its most stable known isotope has mass number 270 and its ground-state electron configuration is [Rn] 5fĀ¹ā“ 6dāµ 7sĀ². Its properties are largely predicted, as only a few atoms have ever been produced.
Bohrium facts
| Atomic number (Z) | 107 |
|---|---|
| Symbol | Bh |
| Mass number of most stable isotope | [270] |
| Category | Transition metal |
| Group | 7 |
| Period | 7 |
| Block | d-block |
| Electron configuration | [Rn] 5fĀ¹ā“ 6dāµ 7sĀ² |
| Electronegativity (Pauling) | ā |
| State at 20 Ā°C | Unknown (synthetic) |
| Protons / electrons | 107 / 107 |
| Neutrons (most common isotope, approx.) | 163 |
| Molar mass | 270 g/mol |