Neptunium-235.html



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Neptunium-235 is a radioactive isotope of neptunium with 93 electrons and protons and 142 neutrons. It has a half-life of 400 days. This isotope of Neptunium either decays by:

• Emitting an alpha particle - Here, the decay energy is 5.2 MeV and the decay product is Protactinium-231.
• Electron capture - Here, the decay energy is 0.125 MeV and the decay product is Uranium-235

This particular isotope of neptunium has a weight of 235.0440633 grams/mole. It is not abundant in nature because it is unstable.