1. Modern Atomic Theory The Quantum Mechanical Model

2. Blackbody Radiation

3. 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

4. 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

5. 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)

6. 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

7. Boy Genius • Louis de Broglie (1892 – 1987) • Discovered that e- not only act as particles, but act like waves too.

8. The Spin Doctor • Wolfgang Pauli (1900 – 1958) • Determined that the e- has one of two angular momentums “spins” • e- spin on an axis

9. 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

10. 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)

11. Define the following terms… • Superposition • Entanglement