on of their fleeting presence.

Early enthusiastic researchers complained that a man's life was not long
enough to let him do all the work he would like on an element. The
situation has now reached a state of equilibrium; neither man nor
element lives long enough to permit all the desired work.

[A] In August 1964 Russian scientists claimed that they created element
104 with a half-life of about 0.3 seconds by bombarding plutomium with
accelerated neon-22 ions.

Table I. THE TRANSURANIUM ELEMENTS

========================================================================
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. Segre 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
U