If a radioactive isotope undergoes beta decay, the daughter isotope that is produced has an atomic number that is increased by one.
Beta decay is the radioactive disintegration results in a change of one positive charge without any change in the mass number of the atomic nuclei.
An unstable nucleus produces an energetic electron and an antineutrino during electron emission, which is also known as negative beta decay, and a neutron inside the nucleus changes into a proton inside the product nucleus. As a result, negative beta decay produces a daughter nucleus whose mass number is the same but whose atomic number is one higher than that of its parent.
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