Download Bohr Quantum Model of the Atom

Bohr Quantum Model of the Atom
Bohr
§  postulated that classical radiation theory did not hold for
atomic systems
Classical theory: Continuous spectrum of radiation
Bohr Quantum Model of the Atom
Bohr
§  postulated that classical radiation theory did not hold for
atomic systems
§  applied Planck’s ideas of quantized energy levels to orbiting
electrons and postulated that:
electrons in atoms are confined to stable, non-radiating energy
levels and orbits (stationary states)
Bohr Quantum Model of the Atom
Bohr
§  postulated that classical radiation theory did not hold for
atomic systems
§  applied Planck’s ideas of quantized energy levels to orbiting
electrons and postulated that:
electrons in atoms are confined to stable, non-radiating energy
levels and orbits (stationary states)
§  applied Einstein’s concept of the photon to arrive at an
expressions for the frequency of the light emitted when
electron jumps from one stationary state (i) to another (f)
ΔE = hν
hν
Ei − E f = hν
Bohr Quantum Model of the Atom
Bohr
§  postulated that classical radiation theory did not hold for
atomic systems
§  applied Planck’s ideas of quantized energy levels to orbiting
electrons and postulated that:
electrons in atoms are confined to stable, non-radiating energy
levels and orbits (stationary states)
§  applied Einstein’s concept of the photon to arrive at an
expressions for the frequency of the light emitted when
electron jumps from one stationary state (i) to another (f)
§  postulated that the electron orbital momentum is quantized
L = n
where n = 1, 2, … (integer)
Bohr Quantum Model of the Atom
Bohr
§  postulated that classical radiation theory did not hold for
atomic systems
§  applied Planck’s ideas of quantized energy levels to orbiting
electrons and postulated that:
electrons in atoms are confined to stable, non-radiating energy
levels and orbits (stationary states)
§  applied Einstein’s concept of the photon to arrive at an
expressions for the frequency of the light emitted when
electron jumps from one stationary state (i) to another (f)
§  postulated that the electron orbital momentum is quantized
Justification of Bohr’s postulates:
comparison with experimental observations!