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Introduction to solid state Chemistry - Lecture 3 - Donald R. Sadoway

Atomic Spectra of Hydrogen and Matter/Energy Interactions Involving Atomic Hydrogen

Lecture Summary

Prof. Sadoway talks about the principles of modern chemistry and how that led to the understanding of the structure of the atom. He details Bohr's postulates for the hydrogen atom and discusses how the Planck-Einstein relationship applies to electron transitions. He defines the different isotopes of hydrogen.

This lecture includes the following:

  • J. J. Thomson's "plum pudding" model
    • Electrons are distributed uniformly throughout the atom
  • Ernest Rutherford's "nuclear" model
    • Conclusions from the gold foil experiment
    • Majority of the mass is found in the nucleus
    • Electrons orbit around the nucleus
  • Niels Bohr's quantization condition
    • Explanation of blackbody radiation and atomic spectra
    • Postulates:
      • Electrons follow circular orbits around a nucleus
      • Orbital angular momentum is quantized hence only certain orbits are possible
      • Electrons in stable orbits do not radiate
      • Electrons change orbits by radiating or absorbing photons
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