As we know, in a positron decay, by the involvement of weak forces, a proton converts into an neutron, emitting a neutrino and a positron, all of this happens inside the nucleus.
Why doesn't the emitted positron, while coming out of the nucleus, and passing through the electron cloud annhiliate an electron?
Now, the new nucleus has a proton less and a neutron more. Will the atom still remain electrically neutral? If yes, then the total protons must be equal to the electrons, since one proton is reduced in the interaction, one electron also must reduce, where does this electron go?
Also, my Professor told me that some nuclei who aren't "sufficiently unstable" cannot undergo positron decay. Instead they undergo K-electron capture. What is the necessary condition for positron decay? And why does an electron get "captured' by the nucleus? Is there a force/interaction responsible for this?