DefinitionA <NEPTUNIUM> is an <Atom> and a <CHEMICAL ELEMENT> with symbol Np and atomic number 93. It is a radioactive actinide metal and the first transuranic element
Standard state: solid Colour: silvery metallic Discoverer: Edwin M. McMillan, P. H. Abelson Date discovered: 1940 Discovered at: United States Meaning of name: Planet Neptune
