Neptunium is a chemical element; it has symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond …

Element Neptunium (Np), Group 20, Atomic Number 93, f-block, Mass [237]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Neptunium (Np), radioactive chemical element of the actinoid series of the periodic table that was the first transuranium element to be artificially produced, atomic number 93. Though traces of …

2023年12月28日 · Neptunium, which belongs to the actinide class of the Periodic Table, has an atomic number of 93. It lies between plutonium (94) and uranium (92). It was the first …

Neptunium has the largest liquid range of any element, 3363 K, between the metal melting point and boiling point. It is the most dense of all the actinides and the fifth most dense of all …

Neptunium is the first transuranic element and belongs to actinide series. All transuranic elements are unstable and decay into other elements radioactively. It is represented by the symbol Np …

The chemical element neptunium is classed as an actinide metal. It was discovered in 1940 by Edwin McMillan and Philip H. Abelson. Neptunium was the first synthetic transuranium …

2017年10月10日 · Neptunium is sandwiched on the periodic table between uranium and plutonium, which are also radioactive. All three of these elements, named after planets, have …

Neptunium is a chemical element of the periodic table with chemical symbol Np and atomic number 93 with an atomic weight of 237 u and is classed as actinide. Neptunium is solid at …

Neptunium is a metallic solid and very reactive radioactive actinide that was long theorized to exist (Dmitri Mendeleev - 1870s) before finally being synthesized during the atomic age of 1940. …