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beta decay results from the transformation of a neutron in the nucleus to a proton (+ charge) and an electron (beta particle). The proton remains in the nucleus increasing the atomic number by one (mass number remains the same) while the electron is emitted as a beta particle. So, U-235 of atomic number 92 changes to Neptunium with atomic number 93.

However, to my knowledge, U-235 decays by gamma not beta. U-236 decays by beta to Neptunium-236.

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Q: What happens when U-235 emits a beta particle?
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