[noh-bel-ee-uhm, -bee-lee-]
noun Chemistry, Physics.
a transuranic element in the actinium series. Symbol: No; atomic number: 102.

1955–60; < Neo-Latin; after Nobel Institute, where first discovered; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nobelium (nəʊˈbiːlɪəm)
a transuranic element produced artificially from curium. Symbol: No; atomic no: 102; half-life of most stable isotope, 255No: 180 seconds (approx.); valency: 2 or 3
[C20: New Latin, named after Nobel Institute, Stockholm, where it was discovered]

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American Heritage
Medical Dictionary

nobelium no·bel·i·um (nō-běl'ē-əm)
Symbol No
A radioactive synthetic element in the actinide series; its longest-lived isotope is No 259 with a half-life of 58 minutes. Atomic number 102.

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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nobelium   (nō-běl'ē-əm)  Pronunciation Key 
Symbol No
A synthetic, radioactive metallic element in the actinide series that is produced by bombarding curium with carbon ions. Its longest-lived isotope is No 255 with a half-life of 3.1 minutes. Atomic number 102. See Periodic Table.
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Encyclopedia Britannica


synthetic chemical element of the actinoid series of the periodic table, atomic number 102. Not occurring in nature, nobelium (as the isotope nobelium-254) was discovered (April 1958) by Albert Ghiorso, T. Sikkeland, J.R. Walton, and Glenn T. Seaborg at the University of California, Berkeley, as a product of the bombardment of curium (atomic number 96) with carbon ions (atomic number 6) accelerated in a heavy-ion linear accelerator. An international team of scientists working at the Nobel Institute of Physics in Stockholm had claimed less than a year before that they had synthesized the same element, which they named nobelium (for Alfred Nobel); but experiments performed in the Soviet Union (at the I.V. Kurchatov Institute of Atomic Energy, Moscow, and at the Joint Institute for Nuclear Research in Dubna) and in the United States (University of California, Berkeley) failed to confirm the discovery. The Berkeley and Dubna teams have subsequently produced more than a half dozen isotopes of nobelium; nobelium-255 (three-minute half-life) is the stablest. Using traces of this isotope, radiochemists have shown nobelium to exist in aqueous solution in both the +2 and +3 oxidation states. The +2 state is very stable, an effect more pronounced than was anticipated in comparison with the homologous lanthanoid element ytterbium (atomic number 70)

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