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Chem 1035 Chapter 7 1 of 31 Chapter 7 Quantum Theory and Atomic Structure Review of the Atom: ••••This chapter focuses on the electrons –where are they? Their location determines the reactivity of the atom.Early studies of light contributed to the current model of the atom.
Chem 1035 Chapter 7 2 of 31 The Electromagnetic Spectrum and Atomic Spectra Light travels as waves (a transmission of energy) with the following properties:Wavelength: Frequency: Velocity:
Chem 1035 Chapter 7 3 of 31 Speed of light, wavelength and frequency are related:Wavelength and frequency are: Short wavelength: Long wavelength: Electromagnetic spectrum: Divided into different “regions”, depending on wavelength
Chem 1035 Chapter 7 4 of 31
Chem 1035 Chapter 7 5 of 31 Planck’s Idea:Energy is not continuous but is emitted in “packets”:The energy of a photon is: E = E = h = Planck’s constant: 6.626×10–34J∙s
Chem 1035 Chapter 7 6 of 31 Example Problem: Green light has a wavelength of 522 nm. (a) What is the frequency of this light? (b) What is the energy of a photon of green light? (c) What is the energy of one mole of photons of green light? (a) frequency: (b) energy of a photon: (c) energy of a mole of photons: