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Unformatted text preview: UNIT ONE (CHAPTER 12) : QUANTUM MECHANICS AND ATOMIC THEORY • At the beginning of the XX century, Rutherford proposed his nuclear atom model. It was a breakthrough! • Using classical mechanics, Rutherford attempted to describe the electronic structure. He failed! • Soon, it became clear that the laws of classical mechanics that applied very nicely to the macroscopic world do not apply in the world of electrons. New laws had to be developed. • The idea that matter and energy were two completely distinct entities had to be revised. • Quantum mechanics was developed and lead to the development of the modern nuclear model of the atom. Electromagnetic Radiation • In the atomic world, we “observe” objects based on how they interact with electromagnetic radiation (light). Once our observations are done, we can propose a structure. • Electromagnetic Radiation is a form of energy transmission. It consists of an oscillating electric and magnetic field that travel perpendicular to each other and to the direction of propagation through space (fig 12.1). Examples: microwaves, infrared, visible light, ultraviolet, x-ray, etc.. • Because a charged particle, such as the electron, interacts with an electric field, electromagnetic radiation makes a good tool for the study of the atom. (Think about a swimmer and a wave!) • Electromagnetic radiation, radiant energy, can be described in terms of waves and is characterized by its wavelength and its frequency....
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