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neptunium
DEFINITIONS OF:
neptunium
1
n
a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
Synonyms:
Np
,
atomic number 93
Type of:
metal
,
metallic element
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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