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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
All isotopes of uranium are radioactive. Naturally occurring uranium contains three isotopes, namely 238U, 235U, and 234U. 235U and 238U are the origin of two different decay chains, whereas 234U is derived from the decay chain of 238U.