neptunium /nep·tu·ni·um/ (Np) (nep-toon´e-um) a chemical element, at. no. 93.
neptunium (Np)
nep·tu·ni·um (n p-t  n - m)n. Symbol Np A metallic radioactive element found in trace quantities in uranium ores or synthesized; its longest-lived isotope is Np 237 with a half-life of 2.1 million years. Atomic number 93. |
neptunium (Np)
[nept(y)o̅o̅′nē·əm]
Etymology: planet Neptune
a transuranic, metallic element. Its atomic number is 93, and its atomic mass is 237. Although neptunium is considered a synthetic element, traces of natural neptunium have been found in uranium ores.
neptunium
a chemical element, atomic number 93, atomic weight 237, symbol Np. See Table 6.
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