question_answer

A nucleus contains no electrons, yet it ejects them. How? Or How are \[\beta \] -rays emitted from a nucleus, when it does not contain electrons?                                    

Answer:

                A neutron of a nucleus decays into a proton, an electron and an antineutrino. It is this electron which is emitted as \[\beta \] -particle.                 \[_{0}^{1}n\xrightarrow{{}}_{1}^{1}p+_{-1}^{0}e+\bar{v}\]