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Q.
A free neutron decays into a proton, an electron and :
BVP MedicalBVP Medical 2006
Solution:
Pauli suggested that after emission of $ \beta - $ particle (electron) a neutron is converted into a proton in a nucleus and in this reaction an electron and an anti-neutrino $ (\overrightarrow{v}) $ will be formed. This reaction is represented as $ \underset{(Neutron)}{\mathop{_{0}{{n}^{1}}}}\,\to \underset{(\Pr oton)}{\mathop{_{1}{{H}^{1}}}}\,\,\,\,\,\,+\,\,\underset{(Electron)}{\mathop{_{-1}{{\beta }^{0}}}}\,\,\,\,+\,\,\underset{(Anti\,-\,neutrino)}{\mathop{\,\overline{v}}}\, $ Antineutrino is a particle whose mass is negligible and on which no charge is present. $ \Rightarrow $ After emission of P-particle, the total number of particles (mass-number) in a nucleus remains unchanged but no. of neutrons reducing by 1 makes the no. of protons (i.e., charge-number) to increase by 1.