Electromagnetic Spectrum and the Quantum Mechanical Model of the Atom

Recall that all light (both visible, and invisible parts of the EM spectrum) are waves that travel at the speed of light, which is the constant "c". Photons are massless and exhibit wave-particle duality, meaning they have properties of both waves (interference, etc.) and particles when in motion at "c". The equations of energy that relate frequency and wavelength apply to the EM spectrum. When excited (high-energy) electrons fall toward the nucleus, they lose energy and photons are emitted.
+ Intro to Quantum Mechanics PPT (General)
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Light! (Crash Course Astronomy)
What is Light? (Wave-Particle Duality)
The Electromagnetic Spectrum
Introduction to Light / Electromagnetism (Khan Academy)
+ Electromagnetic Equations of Light: Wavelength, Frequency, and Energy (2018 Version)
+ Electromagnetic Equations of Energy, Frequency, and Wavelength (2016 Version)
Converting Wavelength to Energy using E=(hc)/λ
+ Introductory Example: Energy, Frequency, and Wavelength. Part 1 
+ Introductory Example: Energy, Frequency, and Wavelength. Part 2 
+ Applied Example: EM Equations. Example 1
+ Applied Example: EM Equations. Example 2

Valence Electrons, Electron Configurations, & Orbital Diagrams
+ Electron Configurations: From Novice to Ninja!
+ Electron Orbital Diagrams 
Crash Course Chemistry: The Electron
Determining Valence Electrons (Tyler DeWitt)
Introduction to Electron Configurations (s-, p-, d-, and f-blocks)
How to Write Electron Configurations (includes Aufbau, Pauli Exclusion, and Hunds' Rules)
Orbital Diagrams and "The Rules" (Aufbau, PEP, Hunds)
Another Tutorial on Orbital Diagram Filling