The relationship between an hydrogen atom's energy levels, sublevels and atomic orbitals lies in the fact that hydrogen atom has a shell with energy level of 1 and the energy sublevels are similar as there's only one and have the same energy, and lastly, only one atomic orbital exists in a hydrogen atom
Ultimately, the hydrogen atom has only one electron In the energy level 1, sublevels with equal energy as there are no sublevels in the energy level 1 and only the 1s atomic orbital.
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