Chapter 7 Quantum Theory of The Atomdone

Chapter 7 Quantum Theory of The Atomdone - Chapter 7...

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Chapter 7 Quantum Theory of the Atom 7.1 The Wave Nature of Light 7.2 Quantum Effects and Photons 7.3 The Bohr Theory of the Hydrogen Atom 7.4 Quantum Mechanics 7.5 Quantum Numbers and Atomic Orbitals
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7.1 The Wave Nature of Light The wavelength ( ) λ is the distance between any two adjacent identical points of a wave. The frequency ( ) ν is the number of wavelengths that passes a fixed point in one unit of time. Speed of light c = νλ Note that: λ c v = v c λ =
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7.2 Photons Einstein postulated that light consists of quanta, which we now call photons. Photons are particles of electromagnetic energy.
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Line Emission Spectrum of Hydrogen Atoms
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7.3 Bohr’s Theory Postulate 1: Electrons moves in circular orbits. Postulate 2 : An electron can have only specific energy values in an atom, which we call its energy levels.
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Postulate 3 : An electron in an atom can change energy only by going from one energy level to another energy level – the electron, by so doing, undergoes a transition. E = h ν E = h ν
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- = 2 i 2 f H n 1 n 1 R hv : photon emitting of energy The The Weakness of Bohr’s Atomic Postulates 1. Bohr’s approach did not account for the emission spectra of atom containing more than one electron. 2. Electrons are wavelike. We cannot define the
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Chapter 7 Quantum Theory of The Atomdone - Chapter 7...

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