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Interactive exercise. Assistance may be required.

Before beginning the lesson, take a quick pre-assessment to refresh your memory about some of the things you already know about atomic structure, light, and emission spectra.

Sources of images used for this section as they appear, top to bottom:

Atom with nucleus surrounded by electron orbits: Rutherford atom, Cburnett, Wikimedia Commons
Light bulb shining: Light bulb Glow, No W ay, Wikimedia Commons
Mercury atom: Electron Schell 080 Mercury, Greg Robson, Wikimedia Commons
Waves in different colors: Photon waves, Maksim, Wikimedia commons