This program explores John Dalton’s chemical atomic theory and the support it lent to previous observations such as Proust’s law of definite proportions. The program also demonstrates experiments using electricity and devices like the cathode ray tube by Michael Faraday, William Crookes, Thomson (his "raisin bun" theory), and R. A. Millikan. (10 minutes)

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Part of the Series : Structure of the Atom

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		The Bohr Model Niels Bohr was able to salvage Rutherford's model of the atom in spite of its shortcomings. Bohr studied quantized energies, orbit radii, and electron velocities and concluded that electrons may occupy only certain precise orbits, or energy levels. H...(more details)		VHS $49.95 DVD $49.95
		Spectra This program looks at Bohr's revolutionary proposals that brought atomic structure into the realm of quantum physics. Using spectroanalysis, Bohr was able to predict all frequencies of radiation for the hydrogen atom, but his model could not predict ...(more details)		VHS $49.95 DVD $49.95
		The Wave-Mechanical Model Speculation on the wave nature of matter led physicist Louis-Victor de Broglie to predict the allowable orbits and radii of atoms. This discovery was the key to explaining the behavior of multi-electron atoms and multi-atom compounds by establishing ...(more details)		VHS $49.95 DVD $49.95
		The Rutherford Model This program examines Ernest Rutherford's contributions to atomic theory, beginning with his use of radioactivity to probe the atom. (He concluded that it was mainly empty space.) Rutherford also proposed that the nucleus of the atom was positively c...(more details)		VHS $49.95 DVD $49.95
		The Earliest Models Who were the first scientists to ask, "How big is small, and can things be divided in half forever?" This program examines the developments in the study of the atom through the ages, from the Greek atomist Democritus, through Roger Bacon, William Gil...(more details)		VHS $49.95 DVD $49.95

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