atomic number 100 definition of atomic number 100 in the Free Online Encyclopedia.

fermium (fûr`mēəm) [for Enrico Fermi Fermi, Enrico (ĕnrē`kō fĕr`mē), 1901–54, American physicist, b. Italy.
..... Click the link for more information. ], artificially produced radioactive chemical element; symbol Fm; at. no. 100; mass no. of most stable isotope 257; m.p. 1,527°C;; b.p. and sp. gr. unknown; valence +2, +3. Fermium is a member of Group 3 of the periodic table periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley . In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the
..... Click the link for more information. . The physical properties of fermium are largely unknown; its chemical properties are believed to be similar to those of the other members of the actinide series actinide series, a series of radioactive metallic elements in Group 3 of the periodic table . Members of the series are often called actinides, although actinium (at. no. 89) is not always considered a member of the series.
..... Click the link for more information. . The eighth transuranium element transuranium elements, in chemistry, radioactive elements with atomic numbers greater than that of uranium (at. no. 92). All the transuranium elements of the actinide series were discovered as synthetic radioactive isotopes at the Univ.
..... Click the link for more information. to be discovered, fermium was first identified (1952) as fermium-255 (half-life half-life, measure of the average lifetime of a radioactive substance (see radioactivity ) or an unstable subatomic particle. One half-life is the time required for one half of any given quantity of the substance to decay.
..... Click the link for more information. about 20 hours) by Albert Ghiorso and his coworkers, who discovered it in residue from the first thermonuclear test explosion in the South Pacific. Twenty isotopes, all of which are radioactive, are known; the most stable is fermium-257, with a half-life of about 100 days. Isotopes of fermium have been produced by neutron bombardment of plutonium.

fermium (redirected from atomic number 100)

fermium
(redirected from atomic number 100)