| Np | neper; neptunium; neurophysin |
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| neptunium | <chemical> Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol np, atomic number 93, and atomic weight 237. Chemical name: Neptunium (12 Dec 1998) |
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Synonyms :
| neptunium |
a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
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| neptunium | a radioactive transuranic metallic element |
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