bn:01874983n
Noun Concept
Categories: Neptunium, Isotopes of neptunium, Lists of isotopes by element
EN
isotope of neptunium  isotopes of neptunium  Neptunium-219  Neptunium-220  Neptunium-223
EN
Neptunium is usually considered an artificial element, although trace quantities are found in nature, so a standard atomic weight cannot be given. Wikipedia
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