neptunium neptunium  /nɛp ˈtu ni əm/

Definition(s):

  • (n) a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

Synonym(s)

np

Usage(s):

  • Some of the neutrons produced by these fissions are absorbed by the more phlegmatic U-238; This forms a new, unstable element, neptunium, which soon turns into plutonium.

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