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How many protons neutrons and electrons in uranium 240? Uranium 240 has 92 protons and electrons, but 148 neutrons because the atomic number is 92 and the atomic mass is 240. Edit
Both neptunium and plutonium can be detected in uranium minerals, though the amounts are small. Uranium minerals regularly contain 1.8 microgrammes of neptunium and up to 0.15 microgrammes of plutonium per ton uranium. In addition there is also primeval plutonium on Earth. The isotope 244 has a half-life of 82.6 million years, and this is enough that a minute amount has survived since the elements making up the Earth were created in the last supernova event before the birth of the solar system.