A long time ago, when I did my degree I was taught that Neutrons have a half life of (about 10 minutes?). I also remember that the elementry particle equation was: N <-> P+e. Now, a proton plus an electron could look a lot like a hydrogen atom and I also remember that the electron in a hydrogen atom at it's lowest allowed energy does a figure 8 through the nucleus with a node in it's centre. The proton has a small radius, I know, but it seems like the electron would occasionally be in the proton? I am also thinking of the energy being negotiable because of the HUP. Now I am probably sounding confused. The question I would like to ask is: Is there a probability (perhaps a very small one) that a hydrogen atom can decay into a neutron? Why/Why not?