Word:

berkelium

ber`ke´li`um   Pronunciation: bẽr`kē´lė`ŭm
n.1.a chemical element of the transuranic series. Chemical symbol Bk; atomic number 97; atomic weight 247. It is a radioactive element, with no stable isotopes; the longest-lived isotope is of mass number 247.07, decaying by alpha-emission with a half-life of 1,400 years. The isotope with atomic weight 249 has a half-life of 314 days, and was isolated in weighable quantities.
Noun1.berkelium - a radioactive transuranic element; discovered by bombarding americium with helium
Synonyms: atomic number 97, Bk
atomic number 97, Bk, metal, metallic element
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