| 单词 | berkelium |
| 释义 | berkelium[ ber-kee-lee-uhm ] / bərˈki li əm / noun Chemistry.a transuranic element. Symbol: Bk; atomic number: 97; atomic weight: 249 (?). Origin of berkelium1945–50; named after Berkeley, California, where it was discovered; see -ium Words nearby berkeliumBerkeleian, Berkeleianism, Berkeley, Berkeley Castle, Berkeleyism, berkelium, Berkley, Berkner Island, berko, Berks, Berkshire Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for berkeliumberkelium / (bɜːˈkiːlɪəm, ˈbɜːklɪəm) / nouna metallic transuranic element produced by bombardment of americium. Symbol: Bk; atomic no: 97; half-life of most stable isotope, 247 Bk: 1400 years; valency: 3 or 4; relative density: 14 (est) Word Origin for berkeliumC20: named after Berkeley 1, where it was discovered Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for berkeliumberkelium [ bər-kē′lē-əm, bûrk′lē-əm ] n. Symbol BkA synthetic radioactive element. Its most stable isotope, Bk 247, has a half-life of 1,380 years. Atomic number 97. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for berkeliumberkelium [ bər-kē′lē-əm, bûrk′lē-əm ] BkA 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. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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