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Modern Atomic Theory. The Quantum Mechanical Model. Blackbody Radiation. The Reluctant Revolutionary. Max Planck (1858-1947) Studied the profile of electromagnetic radiation emitted from a solid body heated to incandescence (black body radiation) ΔE = hν. Enter the Quanta.

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modern atomic theory

Modern Atomic Theory

The Quantum Mechanical Model

the reluctant revolutionary
The Reluctant Revolutionary
  • Max Planck (1858-1947)
  • Studied the profile of electromagnetic radiation emitted from a solid body heated to incandescence (black body radiation)
  • ΔE = hν
enter the quanta
Enter the Quanta
  • Notice that the max shifts lower as temperature increases
  • The ranges are not infinite
  • Energy is QUANTIZED
  • Radiation is emitted as discrete packets of energy proportional to their frequency
the patent clerk
The Patent Clerk
  • Albert Einstein (1879 - 1955)
  • Photoelectric effect
  • Matter exhibits particulate and wave properties
  • Determined amounts of energy required to remove electrons from orbits
  • Recall the dual nature of light (photons)
the golden dane
The Golden Dane
  • Niels Bohr (1885 – 1962)
  • Atomic core is still +
  • Orbits are quantized
  • e- absorb E, excite to higher n levels, return to ground state and emit the excess E as a photon of light
boy genius
Boy Genius
  • Louis de Broglie (1892 – 1987)
  • Discovered that e- not only act as particles, but act like waves too.
the spin doctor
The Spin Doctor
  • Wolfgang Pauli (1900 – 1958)
  • Determined that the e- has one of two angular momentums “spins”
  • e- spin on an axis
certain uncertainty
Certain Uncertainty
  • Werner Heisenberg (1901 – 1976)
  • Both momentum and velocity cannot be measured accurately
  • The more precisely one property is known the less precisely a second can be known
a cat in the box
A Cat in the Box
  • Erwin Schrödinger (1887 – 1961)
  • Quantum orbits are related to specific geometric properties
  • Wave mechanics (accurately predicted energies produced by atoms)
define the following terms
Define the following terms…
  • Superposition
  • Entanglement