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Bohr Model

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Hydrogen Model A hydrogen atom is a single electron and proton. One negative charge One positive charge Assume that the discrete energies are associated with stable orbits. Coulomb potential

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Circular Orbit Electrons are in stable circular orbits. Coulomb force is centripetal forceCoulomb force is centripetal force Radius rRadius r Allow nucleus charge ZAllow nucleus charge Z

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Quantized Angular Momentum Bohr assumed that the angular momentum of the circular orbit was quantized. Circumference 2 rCircumference 2 r Quantum number n is an integerQuantum number n is an integer This combined with the force equation to get quantized radii.

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Discrete Jumps Atomic transitions follow jumps between Bohr levels. Radius to potential

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Hydrogen Energy Levels Most common emission is from transitions between free electrons and bound states. Emission series for hydrogen have defined names for inner energy number n. Lyman 1 Balmer 2 Paschen 3 Brackett 4 next

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