I have heard and read about astatine's radioactivity, and it makes no sense to me. Why is it so unstable? Uranium has a half life ranging from 70 to 4.5 billion years (natural isotopes), and it has 7 extra protons to deal with. I know that atomic nuclei can be stabler if they are spherical, implying that if you make a nucleus that isn't spherical you could destabilize it, but astatine has a maximum half life of 8 hours. Can someone explain this to me?
Information came from a few sources, including SciShow and Wikipedia.