• Name: Neptunium

  • Symbol: Np

  • Number of Energy Levels: 7

  • Electrons on the outer energy level: 2

  • Atomic Number: 93

  • Atomic Mass: 237 Amu

  • Protons / Electrons: 93

  • Neutrons: 144

  • Density: 20.45 g/cm3

  • Classification: Rare Earth

Top 12 interesting facts about Neptunium

  • Neptunium was discovered in 1940 by Edwin McMillan and Phillip H. Abelson. Its name derives from the name of the planet Neptune.
  • Neptunium's melting point is at 640.0 C (913.15 K, 1184.0 F) and its boiling point is at 3902.0 C (4175.15 K, 7055.6 F).
  • Neptunium is a ductile, hard, and radioactive metal.
  • Neptunium is a fissionable element.
  • Neptunium has a silvery color and tarnishes in the air.
  • Most of neptunium is produced in nuclear reactors as a by-product.
  • Neptunium is also found in uranium ores in very small amounts as a decay product of other isotopes.
  • All neptunium's isotopes are unstable and the most stable isotope of neptunium is 237-neptunium.
  • Neptunium is used in detectors of high-energy neutrons.
  • Neptunium is used as a precursor in plutonium production.
  • Neptunium could be used as fuel for fast neutron reactors and in nuclear weapons.
  • Neptunium does not have any biological role.