Author: Khan Academy via YouTube
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Electrons only exist at specific, discrete energy levels in an atom. If an electron absorbs a photon with energy equal to the difference between two energy levels, the electron will transition to the higher energy level. The atom is then in an excited state. When an electron transitions to a lower energy level, it emits a photon with energy equal to the difference. Every element has a unique emission/absorption spectrum, making atomic spectral lines a valuable tool for identifying elements in distant astronomical objects.

Sections:
00:00 – Intro
00:26 – Electron potential well
03:08 – Orbital shapes
05:37 – Bohr model and energy level diagram
07:09 – Electron excitation and de-excitation
09:36 – Hydrogen’s spectrum
10:54 – Spectral analysis
11:46 – Absorption spectrum
14:11 – Summary

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