a silver-colored, radioactive, metallic chemical element, one of the actinides, produced by bombarding uranium atoms with neutrons: symbol, Np; at. no. 93
Origin of neptuniumModern Latin from Classical Latin Neptunus (see Neptune) + -ium: so named by E. M. McMillan and P. Abelson (1913-2004), United States physicists, because its atomic number is next after that of uranium, as the planet Neptune is next beyond Uranus
A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See Periodic Table.
Origin of neptuniumAfter the planet Neptune ( from the fact that it follows uranium in the periodic table )
- The transuranic chemical element with atomic number 93 and symbol Np.
After Neptune (the planet).