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5.12: Energy Level - Chemistry LibreTexts
Energy level | Definition, Diagram, & Facts | Britannica
Energy level - Wikipedia
Energy Level - Principal Quantum Number | Bohr's Atomic Model …
Lesson Explainer: Electrons and Energy Levels | Nagwa
Atom - Electrons, Orbitals, Energy | Britannica
Energy Level and Transition of Electrons - Brilliant
Khan Academy
18.1: Energy Distributions and Energy Levels