Answer:
A neutron from the nucleus decays to emit a proton, an electron and an antineutrino. The electron is emitted in the form of a \[\beta \] -particle. \[_{0}^{1}n\to _{1}^{1}p+_{-1}^{0}e+\overset{-}{\mathop{v}}\,\] During \[\beta \] -decay, a neutron simply changes into a proton i.e., only the character of nucleon changes. Hence the mass number of a radioactive nuclide does not change during a\[\beta \]-decay.
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