Hi everyone: This concept has bothered me for a while. The concept being that two oppositely charged particles (electron and proton) are attracted to each other, but the electrons go on a orbital trajectory around the nucleus instead of directly "sticking to" the nucleus. The closest I have come to a reasonable answer lies within the theories of quantum mechanics, ie. Uncertainty Principle, Wave behavior of electrons, Kinetic energy, etc. It all confuses me when it comes to the probability of the electron's path. A path straight towards the nucleus has to be included in that statistic. How can it deliberately avoid contact with the nucleus? It can't be centripetal force keeping it from the nucleus because that involves acceleration, which should be straight toward the nucleus.