Berkelium



a transuranic element. Symbol: Bk; atomic number: 97; atomic weight: 249 (?).
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)
berkelium
(bər-kē’lē-əm, bûrk’lē-əm)
Symbol Bk
A synthetic, radioactive metallic element of the actinide series that is produced from americium, curium, or plutonium. Its most stable isotope has a half-life of about 1,400 years. Atomic number 97; melting point 986°C; valence 3, 4. See Periodic Table.

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