Excitation of the electron into each successive orbit reduces the classical electron velocity by a factor of two and therefore its kinetic energy by four until eventual ionization. The complementary capture of an electron into the S ground state occurred with the emission of a photon and that photon phase entangles the spin phase of the electron. Since the universe is actually not classical, quantum observers and sources are not interchangeable for quantum probabilistic predictions.
In other words, a quantum observer of an electron path or spin cannot predict a precise but only a likely quantum future for that spin. Quantum observer and source are inextricably entangled in the surreal quantum world. Although the chaos of classical noise also limits what a quantum observer can know about a source, in addition, there is quantum phase noise. Unlike the chaos of classical noise, quantum phase noise entangles an observer with a source in ways that the observer cannot ever know. Fundamentally this means that there are quantum effects for an action that do not have knowable causes.
Things happen in the universe because of the actions of both classical gravity biphotons and quantum charge photons. Since gravity biphotons and charge photons are very different magnitudes of force, mainstream science treats them as two very different forces and this also means that there are two very different kinds of observers; one for classical gravity and another for quantum charge. Without a unified photon exchange force that explains both gravity and charge, a classical observer will not see a source the same way as a quantum observer sees the same source.