californium

[kal-uh-fawr-nee-uhm]
noun Chemistry.
a transuranic element. Symbol: Cf; atomic number: 98.

Origin:
1945–50; named after the University of California where it was discovered; see -ium

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World English Dictionary
californium (ˌkælɪˈfɔːnɪəm)
 
n
a metallic transuranic element artificially produced from curium. Symbol: Cf; atomic no: 98; half-life of most stable isotope, 251Cf: 800 years (approx.)
 
[C20: New Latin; discovered at the University of California]

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American Heritage
Medical Dictionary

californium cal·i·for·ni·um (kāl'ə-fôr'nē-əm)
n.
Symbol Cf
A synthetic radioactive element produced in trace quantities by neutron bombardment of curium. Its most stable isotope, Cf 251, has a half-life of 790 years. Atomic number 98.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
californium   (kāl'ə-fôr'nē-əm)  Pronunciation Key 
Symbol Cf
A synthetic, radioactive metallic element of the actinide series that is produced from curium or berkelium and is used in chemical analyses. Its most stable isotope, Cf 251, has a half-life of 800 years. Atomic number 98. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

californium

synthetic chemical element of the actinoid series of the periodic table, atomic number 98. Not occurring in nature, californium (as the isotope californium-245) was discovered (1950) by Stanley G. Thompson, Kenneth Street, Jr., Albert Ghiorso, and Glenn T. Seaborg at the University of California, Berkeley, as a product resulting from the helium-ion bombardment of curium-242 (atomic number 96) in the 60-inch cyclotron.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
It was made by bombarding a californium target with a beam of calcium ions.
The californium undergoes fission, similar to what happens inside a nuclear reactor.
Some of the actinides include plutonium, curium, and californium.
Several targets of californium isotopes were bombarded with beams of boron.
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