Berkelium - Bk
Berkelium (Bk)
Berkelium is a radioactive actinide produced in very small quantities. It does not have a standard atomic weight; the bracketed value below identifies a representative isotope mass number.
| Atomic number | 97 |
|---|---|
| Representative isotope mass number | [247] |
| Electron configuration | [Rn] 5f9 7s2 |
| Density | 14.78 g/cm3 |
| Melting point | 986 °C |
| Boiling point | not established |

Uses and applications
Berkelium has no commercial or technological use at present. It is produced in very small quantities for scientific research into the actinides and heavier elements.
Berkelium and water management
Berkelium is not used in water treatment. If it is encountered in a research or nuclear-related liquid waste stream, it requires radionuclide-specific monitoring and management under appropriate radiological controls.
Occurrence and environmental context
Berkelium is a synthetic actinide with no stable isotopes. Its occurrence outside controlled production is extremely limited. Environmental assessment, if relevant, depends on isotope, activity, chemical form, and the specific source.
Health and safety
Berkelium requires specialised radiological controls. Exposure risk depends on isotope, activity, chemical form, and exposure route. Follow applicable radiation-protection procedures and institutional requirements when handling radioactive materials or waste.
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Sources and further reading
Element page last reviewed: 24 October 2026 by Lenntech.