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CHEM101 (16)
Chapter

Pre Lecture Notes Sept 11.pdf

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Department
Chemistry
Course
CHEM101
Professor
Yoram Apelblat
Semester
Fall

Description
12Atomic spectra and quantum theory Until now most of you thought of light in terms of what is visible to youVisible light however occupies only a small White light can be broken into its color components portion of the entire electromagnetic spectrum See fig 73by a prism AtomsFrom now on we will refer to light for the entire spectrum range 34See fig 78Spectral lines are produced when an e moves from one energy level to another energy level If energy could take continuous valuesthe spectrum would be similar to the visible spectrumThats not the caseConclusionEnergy levels in an atom are not continuous but discrete quantized Only transitions between these levels are allowed and observed Absorptionexcitation from a lower allowed energy level to a higher allowed energy level Emissionrelaxation from a higher allowed energy level to a lower allowed energy level often to the ground level
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