| 单词 | berkelium |
| 释义 | Word Frequency berkelium(bɜːˈkiːlɪəm, ˈbɜːklɪəm) noun 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) Word origin C20: named after Berkeley1, where it was discovered |
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