8 votes

Fundamental doubts about energy levels vs. shells vs. subshells vs. orbitals

Shell, level and orbital can often be used interchangeably although they do have different meanings. The level represents an ordinal or numerical representation of the state and corresponding relative ...
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1 vote

Why do principal energy levels in an atom get closer together as n increases?

That's an artifact of Euclidean space and the geometry of the problem (as explained in another answer), and the fact that the energy of an electron is constrained. As you move an electron away from a ...
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