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Berkelium - Bk General Information Discovery Berkelium was discovered by S.G. Thompson, A. Ghiorso and G.T. Seaborg in 1949 in California, USA. Appearance Berkelium is a radioactive, silvery metal. Source Berkelium is made in milligram quantities only by the neutron bombardment of plutonium. Uses Because of its rarity, berkelium has no commercial or technological use at present. Biological Role Berkelium has no known biological role. It is toxic due to its radioactivity. General Information Berkelium is attacked by oxygen, steam and acids, but not by alkalis. Compounds with oxygen and the halides have been prepared, but only in minute quantities. |
| Physical Information | |||
| Atomic Number | 97 | ||
| Relative Atomic Mass (12C=12.000) | 247 (radioactive) | ||
| Melting Point/K | not available | ||
| Boiling Point/K | not available | ||
| Density/kg m-3 | 14790 (293K) | ||
| Ground State Electron Configuration | [Rn]5f97s2 |
| Key Isotopes | ||||||
| nuclide | 247Bk | 249Bk | ||||
| atomic mass | 247.07 | |||||
| natural abundance | 0% | 0% | ||||
| half-life | 1.4x103 yrs | 314 days |
| Other Information | ||
| Enthalpy of Fusion/kJ mol-1 | n/a | |
| Enthalpy of Vaporisation/kJ mol-1 | n/a | |
| Oxidation States | ||
| Bk+4 | ||
| Ionisation Energies/kJ mol-1 | ||
| M - M+ | 601 | |
| M+ - M2+ | ||
| M2+ - M3+ | ||
| M3+ - M4+ | ||
| M4+ - M5+ | ||
| M5+ - M6+ | ||
| M6+ - M7+ | ||
| M7+ - M8+ | ||
| M8+ - M9+ | ||
| M9+ - M10+ | ||
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