Integrated SequencePhysics Chemistry Organic Biology

Web Resources

Chem1 Virtual Textbook - The Bohr atom
Excellent, comprehensive introduction to the Bohr model of the hydrogen atom.

HyperPhysics - Hydrogen Spectrum

HyperPhysics - Absorption and Emission

Purdue University - Development of Current Atomic Theory
Straightforward introduction to atomic theory and Bohr's model of the hydrogen atom.

PY106 Notes - Understanding the atom
Clearly written, basic overview of the Bohr model.

HyperPhysics - Bohr Orbit

University of Winnipeg - Atomic Spectra
Brief discussion of atomic spectra.

University of Winnipeg - The Bohr Model
Introduction to the Bohr model of the hydrogen atom.

University of Winnipeg - Other Atoms
The problem of extending the Bohr model to other atoms besides hydrogen.

HyperPhysics - The Franck-Hertz Experiment

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Special points of emphasis


Atomic Theory


Our MCAT course is now beginning its transition from the fundamentals of classical physics, including electrostatics, to the beginnings of chemistry in Atomic Theory. As we make this transition from basic physics to chemistry, reflect carefully on preserving the insights that the classical model gives you while keeping in mind that the systems under discussion are quantum electrodynamical. How is the Bohr energy description of the atom similar to the classical description of the potential energy between oppositely charged particles?

Both models present a picture in which oppositely charged particles have a potential energy of zero at infinite separation, with negative values reflecting decreasing potential energy as the electron and nucleus come nearer together.

How is the Bohr model different than the classical model? If the nucleus and electron of a hydrogen atom comprised a 'classical' rather than a quantized electrodynamic system, the potential energy function of an electron would be a continuous, and the emission spectrum, which derives from internal energy changes, would be continuous like a rainbow. On the contrary, however, the observed emission spectrum is a line spectrum corresponding to quantized energy levels for the electron within the atom.

The WikiPremed MCAT Course is a free comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum.

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