97Bk[247]
Berkelium (Bk)
Element 97 · Actinide
Berkelium (Bk) is a chemical element with atomic number 97. It is classified as an actinide in period 7 of the periodic table (the f-block). Its most stable known isotope has mass number 247 and its ground-state electron configuration is [Rn] 5f⁹ 7s².
Berkelium facts
| Atomic number (Z) | 97 |
|---|---|
| Symbol | Bk |
| Mass number of most stable isotope | [247] |
| Category | Actinide |
| Group | — (f-block) |
| Period | 7 |
| Block | f-block |
| Electron configuration | [Rn] 5f⁹ 7s² |
| Electronegativity (Pauling) | 1.3 |
| State at 20 °C | Solid |
| Protons / electrons | 97 / 97 |
| Neutrons (most common isotope, approx.) | 150 |
| Molar mass | 247 g/mol |