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Definition: nobelium from The Penguin Dictionary of Science

Symbol No. The element with atomic number 102 and most stable isotope 259, which is a member of the ➤transuranium elements. Its discovery was claimed by a Scandinavian group which named it after Alfred Nobel, the founder of the ➤Nobel prizes. Their claim was in error but the subsequent true discoverers retained the name. The chemistry of nobelium is dominated by its radioactivity.


Summary Article: nobelium
from The Columbia Encyclopedia

(nōbē'lēəm), artificially produced radioactive chemical element; symbol No; at. no. 102; mass no. of most stable isotope 259; m.p. 827 degrees Celsius; b.p. and density unknown; valence +2, +3. It is a metal of the actinide series in Group 3 of the periodic table. Nobelium was the 10th transuranium element to be discovered. It was first produced and detected in Apr., 1958, by Albert Ghiorso, Torbjørn Sikkeland, John R. Walton, and Glenn T. Seaborg at the Univ. of California at Berkeley; they used a heavy-ion linear accelerator to bombard a mixture of curium-244 and curium-246 with carbon-12 ions, producing nobelium-254 (half-life 55 sec). The name of the element was originally suggested by scientists at the Nobel Institute of Physics, who in 1957 reported synthesis of an isotope of the element; although the name was adopted, it was later shown that the element could not have the properties they reported. Thirteen isotopes, all of which are radioactive, are known; the most stable, nobelium-259, has a 58-min half-life.

The Columbia Encyclopedia, © Columbia University Press 2017

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