  Modern quantum theory introduces quantum structures (decompositions into
subsystems) as a new discourse that is not fully comparable with the
classical-physics counterpart. To this end, so-called Entanglement Relativity
appears as a corollary of the universally valid quantum mechanics that can
provide for a deeper and more elaborate description of the composite quantum
systems. In this paper we employ this new concept to describe the hydrogen
atom. We offer a consistent picture of the hydrogen atom as an open quantum
system that naturally answers the following important questions: (a) how do the
so called "quantum jumps" in atomic excitation and de-excitation occur? and (b)
why does the classically and seemingly artificial "center-of-mass + relative
degrees of freedom" structure appear as the primarily operable form in most of
the experimental reality of atoms?
