Element 239. it is extremely unstable- exists in Bomb ash fall-out, etc, not in nature.
Neptunium, with the chemical symbol Np, is the chemical element with the atomic number 93.
Neptunium has the atomic number 93 and americium has the atomic number 95.
The most important isotope of neptunium (237Np) has the atomic mass 237,048 173 4(20).
Electron configuration of neptunium: [Rn]7s26d15f4
Neptunium is a chemical element. Atomic Number: 93, Atomic Symbol: Np. Neptunium is fissionable. For this, it is used as fuel in a fast neutron reactor or in a nuclear weapon. Neptunium is not a magnet.
The atomic mass of neptunium-237 is 237,048 173 4(20).The density of alpha neptunium is 20,45 g/cm3.
Neptunium is a radioactive actinide element with the atomic number 93. It is situated in the actinide series of the periodic table, which is the row below the lanthanide series, between uranium and plutonium.
neptunium-NP
The element with atomic number 93 is neptunium. It is a radioactive actinide metal that is commonly found in trace amounts in uranium ores.
Neptunium is a member of the actinides group.
It is for element Neptunium. It's atomic no. is 93 and atomic mass is 237g/mol
Neptunium is a radioactive metallic element with the symbol Np and atomic number 93. It was the first transuranium element to be synthesized artificially. Neptunium is primarily produced in nuclear reactors and is commonly used in the production of nuclear weapons and fuel.