A Brief History of Element Discovery, Synthesis, and Analysis

Name: A Brief History of Element Discovery, Synthesis, and Analysis
Author: Watson, Glen W.

Watson, Glen W.

Chemical elements; Chemistry -- History; Transuranium elements -- Synthesis

========================================================================
  Element    Name (Symbol)     Mass     Year Discovered; by whom;
                              Number          where; how
  ------------------------------------------------------------------------
     93     Neptunium (Np)      238    1940; E. M. McMillan, P. H.
                                       Abelson; University of California
                                       at Berkeley; slow-neutron
                                       bombardment of U<238> in the
                                       60-inch cyclotron.
  ------------------------------------------------------------------------
     94     Plutonium (Pu)      238    1941; J. W. Kennedy, E. M.
                                       McMillan, G. T. Seaborg, and A. C.
                                       Wahl; University of California at
                                       Berkeley; 16-MeV deuteron
                                       bombardment of U<238> in the
                                       60-inch cyclotron.

                      (Pu)      239    Pu<239>; the fissionable isotope
                                       of plutonium, was also discovered
                                       in 1941 by J. W. Kennedy, G. T.
                                       Seaborg, E. Segrè and A. C. Wahl;
                                       University of California at
                                       Berkeley; slow-neutron bombardment
                                       of U<238> in the 60-inch
                                       cyclotron.
  ------------------------------------------------------------------------
     95     Americium (Am)      241    1944-45; Berkeley scientists A.
                                       Ghiorso, R. A. James, L. O.
                                       Morgan, and G. T. Seaborg at the
                                       University of Chicago; intense
                                       neutron bombardment of plutonium
                                       in nuclear reactors.
  ------------------------------------------------------------------------
     96     Curium (Cm)         242    1945; Berkeley scientists A.
                                       Ghiorso, R. A. James, and G. T.
                                       Seaborg at the University of
                                       Chicago; bombardment of Pu<239>
                                       by 32-MeV helium ions from the
                                       60-inch cyclotron.
  ------------------------------------------------------------------------
     97     Berkelium (Bk)      243    1949; S. G. Thompson, A. Ghiorso,
                                       and G. T. Seaborg; University of
                                       California at Berkeley; 35-MeV
                                       helium-ion bombardment of

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A Brief History of Element Discovery, Synthesis, and Analysis

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