The energy levels in the hydrogen atom are related to the quantum number n by being proportional to A) n². B) n. C) $\frac { 1 } { \mathrm { n } }$ D) $\frac { 1 } { n ^ { 2 } }$

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The energy levels in a hydrogen atom are inversely proportional to the square of the principal quantum number n, which is represented by the formula $E_n \propto \frac{1}{n^2}$. This relationship is a fundamental principle of quantum mechanics as it applies to the hydrogen atom, derived from the Bohr model and later refined by quantum mechanical treatments.

The Energy Levels in the Hydrogen Atom Are Related to the Quantum