Chemistry - Chemical Kinetics Question with Solution | TestHub

In certain nucleus, the nucleus captures an electron from the $K$-shell (being nearest to the nucleus). The vacancy created is filled up with the electron from the higher shells thereby emitting X-rays. As a result of $K$-electron capture, a proton in the nucleus is converted into a neutron $\left(P^{+}+e^{-}\to n\right)$.