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Lacey_Che131_F2017_Lect-22s.pdf

Lacey_Che131_F2017_Lect-22s.pdf - Modern periodic table...

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10/16/2017 1 Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 1 Lec-22: Light, Spectra, and the Bohr Model of Hydrogen Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 2 Modern periodic table Period Group Transition elements Essential Question: Why do elements interact to form compounds? Æ Requires an understanding of atomic structure Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 3 Atomic Structure Electrons are situated at comparatively large distances (compared to nuclear dimensions) around the nucleus The interaction of radiation with atoms plays an important role in the study of atomic structure Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 4 Electromagnetic spectrum The electromagnetic spectrum is a continuous range of radiant energy. Waves are crucial for characterizing Electromagnetic radiation High frequency/short wavelength Low frequency/long wavelength
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10/16/2017 2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 5 Waves A wave can be described as a disturbance that travels from one location to another . Here Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 6 Waves ` Wavelength ( O ) is the distance from crest to crest or trough to trough on a wave. ` Amplitude of a wave is the height of the crest or depth of the trough with respect to the center line of the wave. Roy A. Lacey, Stony Brook University; Che 131, Fall 2017 7 Waves ` The frequency (f) of a wave expresses the number of times a wave passes a given point in some unit of time.
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