Chapter 7 & 8 - Atomic Structure and Periodicity_Part3

Chapter 7 & 8 - Atomic Structure and...

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GENERAL CHEMISTRY CHAPTERS 7 & 8 - ATOMIC STRUCTURE AND PERIODICITY PAGE 11 OF 28 In this diagram: The length of the string must be equal to a whole number times one-half of the wavelength λ /2 De Broglie reasoned that if an electron acts like a standing wave in the hydrogen atom, the length of the wave must fit the circumference of the orbit (Figure a) If an electron did not behave as in Figure a, every time the electron orbited, the wave would partially cancel itself and the amplitude would be equal to zero (Figure b) According to the equation (below) electromagnetic radiation moves at the speed of light = c m = ? λ ± A particle will move according to velocity = v m = ? λ ² Rearranging the equation: λ = ? ³² Wavelength for an electron (particle) This is known as the dual nature of light λ = ? ³± = ? ³² Dual Nature of Light Example : What is the mass of a blue photon ( λ = 470 nm)?
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GENERAL CHEMISTRY CHAPTERS 7 & 8 - ATOMIC STRUCTURE AND PERIODICITY PAGE 12 OF 28 Disappointments with Bohr’s Model and the Heisenberg Uncertainty Principle Bohr’s approach did not account for the emission spectra of atoms containing more than 1 electron How can the position of a wave be specified a wave extends throughout space Heisenberg stated that it is impossible to precisely know where an electron is and what path it follows = Heisenberg Uncertainty Principle
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Chapter 7 & 8 - Atomic Structure and...

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