Some examples of electron capture. The electron disappears and a new neutron is created from a proton combining with the electron. A neutrino is given off, along with X-rays which are the result of photons being given off as outer shell electrons drop down to lower energy levels to fill the gap and give off energy.
Electron Capture
When a nucleus captures one of its own orbiting electrons (usually from the lowest energy state, or K-Shell), the electron and one of the protons form a neutron, and a new element is formed