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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
The primary difference is the atomic number: uranium has 92 protons, plutonium has 94 protons. Two of the uranium isotopes have half-lives long enough that they are still present in the earth from the formation of our planet 4.5 billion years ago.