Discovery of Neptunium
Neptunium, atomic number 93, has a mass of 237 au.
Radioactive element: Np is only found in tiny amounts in nature. Most samples are synthetic.
Neptunium was first observed in 1940 by E.M. McMillan and H. Abelson.
|Periodic Table, What is it showing?||
© Mark R. Leach 1999-
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