structure and bonding: structure of H atom

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4 Terms

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Quantum theory

theory which describes the structure of atoms and molecules

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Bohr model

electrons go around a nucleus in circular orbits

postulates:

  • electron moves in a circular orbit - electrostatic force = centripetal force

  • only certain orbits are allowed (certain radii) - angular momentum can only have certain integer multiples of a constant

  • if electron move between orbits, light (energy) is emitted

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wave-particle duality

small particles behave as waves

experimental evidence - Davisson and Germer 1925

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de Broglie relation

all matter has characteristics of wavelength and momentum:

  • short wavelength = high momentum

  • long wavelength = low momentum

  • energy of a wave is its curvature

  • more curvature = more kinetic energy