Penneman, Robert A. Los Alamos National Laboratory, Los Alamos, New Mexico.
- Additional Readings
A chemical element, symbol Np, atomic number 93. Neptunium is a member of the actinide or 5f series of elements. It was synthesized as the first transuranium element in 1940 by bombardment of uranium with neutrons to produce neptunium-239. The lighter isotope 237Np, a long-lived alpha emitter with half-life 2.14 × 106 years, is particularly important chemically. See also: Periodic table
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