How many protons, neutrons and electrons are in uranium 235 and uranium 238?

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Uranium is atomic number 92 - this means it has 92 protons - which in a neutral atom means it also has 92 electrons. 235 and 238 are the mass numbers (or nucleon number) of two of its isotopes. The neutron number = the mass number - the atomic(proton) number. So just subtract 92 from both 235 and 238 to get your answer. more
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