| When struck by neutrons, nuclei of neptunium and other nuclear materials can fission into two smaller nuclei. |
| Just as Neptune comes right after Uranus in the solar system, so, too, does neptunium come right after uranium in the periodic table. |
| They produced neptunium, which decayed by beta emission, shunting the element one place further along the Periodic Table. |
| The waste also contains radioactive isotopes of the transuranic elements neptunium, americium, and curium. |
| The new elements were named neptunium and plutonium, respectively. |
| Another option is that of partitioning and the transmutation of the long-lived actinides, americium, curium and neptunium. |
