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单词 berkelium
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ber•ke•li•um  (bər kē′lē əm),USA pronunciation n. [Chem.]
  1. Chemistrya transuranic element. Symbol: Bk;
    at. no.: 97;
    at. wt.: 249 (?).
  • 1945–50; named after Berkeley, California, where it was discovered; see -ium

Collins Concise English Dictionary © HarperCollins Publishers::
berkelium /bɜːˈkiːlɪəm; ˈbɜːklɪəm/ n
  1. a metallic transuranic element produced by bombardment of americium. Symbol: Bk; atomic no: 97; half-life of most stable isotope, 247Bk: 1400 years; valency: 3 or 4; relative density: 14 (est)
Etymology: 20th Century: named after Berkeley1, where it was discovered
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更新时间：2025/2/23 5:19:00