Chapter 30: The Nature of the Atom

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Presentation transcript:

Chapter 30: The Nature of the Atom Essential Concepts and Summary

Rutherford Scattering and Nuclear Atom Rutherford's gold-foil experiment discredited Thomson's plum-pudding model Nuclear atom: model in which positive nucleus surrounded by negative electrons Although planetary model is more correct than plum pudding, it still has serious flaws

Line Spectra Line Spectrum: series of fringes produced when low-pressure gas in sealed tube made to emit e/m waves via large potential difference Lyman, Balmer, and Paschen Series (in that order on the right) R is the Rydberg constant

Bohr Model Works best for hydrogen and singly ionized atoms Assumes electrons are in circular, stationary orbits Photon is emitted when electron goes from higher to lower energy orbit Assumes angular momentum is quantized

Visual References http://www.geo.arizona.edu/xtal/nats101/s04-15.html

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