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/nɛpˈtjuːniəm/ · noun
The transuranic chemical element with atomic number 93 and symbol Np..
Use neptunium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Neptunium means The transuranic chemical element with atomic number 93 and symbol Np..
Common synonyms include atomic number 93, np.
The opposite depends on the specific sense.
Use neptunium where its definition matches the intended context.
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