CHEMISTRY 131 Quiz #1 Friday, January 27, 2006 Name: ___________________________________________ 1. When a gas is heated in a discharge tube, it emits specific wavelengths of light rather than the entire spectrum, as would be predicted by classical physics. What does this imply about the structure of the atom, and who was the scientist who made this hypothesis? (3 points) The fact that only certain wavelengths of light are emitted is an indication that the energies of the electons in the atom are quantized ; that is, the energies are only allowed to have specific values. This in turn must imply that the electrons are located at fixed distances from the nucleus, which contradicts classical physics (which would predict that, since opposite charges attract, the electrons would get as close to the nucleus as possible and would not be limited to specific places). The person who first explained this theory was Niels Bohr. 2. What is the difference between an extended solid and a molecular solid? (3 points)
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