| Bk | berkelium |
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| berkelium | <chemical> Berkelium. A man-made radioactive actinide with atomic symbol bk, atomic number 97, and atomic weight 247. Its valence can be +3 or +4. Twelve isotopes have been produced with mass numbers 240-251. Chemical name: Berkelium (12 Dec 1998) |
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Synonyms :
| berkelium |
a radioactive transuranic element; discovered by bombarding americium with helium
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| berkelium | a radioactive transuranic element |
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