Try Our Apps


Avoid these words. Seriously.


[ber-kee-lee-uh m] /bərˈki li əm/
noun, Chemistry.
a transuranic element. Symbol: Bk; atomic number: 97; atomic weight: 249 (?).
Origin of berkelium
1945-50; named after Berkeley, California, where it was discovered; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
British Dictionary definitions for berkelium


/bɜːˈkiːlɪəm; ˈbɜːklɪəm/
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
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
Cite This Source
berkelium in Medicine

berkelium ber·ke·li·um (bər-kē'lē-əm, bûrk'lē-əm)
Symbol Bk
A synthetic radioactive element. Its most stable isotope, Bk 247, has a half-life of 1,380 years. Atomic number 97; melting point 1,050°C; valence 3, 4.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
berkelium in Science
  (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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for berkelium

Word Value for berkelium

Scrabble Words With Friends