What is another word for neptunium?
Pronunciation: [nɛptjˈuːni͡əm] (IPA) 
Neptunium is a chemical element that has the symbol Np. It is a silvery metal that is highly radioactive and was first discovered in 1940. Since then, numerous other synonyms for neptunium have been identified. Some of the most common synonyms for neptunium include element 93, Np-237, and actinide. Other synonyms include transuranic element, radioactive metal and f block element. Additionally, neptunium is also sometimes referred to as a heavy metal because of its high density and toxicity. Despite its numerous synonyms, neptunium remains an important element in various scientific and industrial applications, particularly in the nuclear energy industry.
