Uranium is one of the heaviest atoms. Uranium always have 92 protons but the number of neutrons can vary. Therefore U-238 will have 92 protons and 146 neutrons while U-235 has 92 protons and 143 neutrons. Number of electrons is always equal to the number of protons.
Inside the fuel a chain reaction has to happen. A chain reaction is caused when a loose neutron hits a U235-atoms and causes it to split. The splitting process gives off smaller atoms, more loose neutrons and heat. If the loose neutrons hit more U-235 then a chain reaction is set up.
Inside the fuel a chain reaction has to happen. A chain reaction is caused when a loose neutron hits a U235-atoms and causes it to split. The splitting process gives off smaller atoms, more loose neutrons and heat. If the loose neutrons hit more U-235 then a chain reaction is set up.
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