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Quantum Mechanical Model

Quantum Mechanical Model. CHM 108 Suroviec Fall 2015. I. Quantum Mechanics. Small is a relative term, but we use it to show size. There is a limit to how we can use it in science. II. Nature of Light. A. Wave Nature of light

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Quantum Mechanical Model

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  1. Quantum Mechanical Model CHM 108 Suroviec Fall 2015

  2. I. Quantum Mechanics • Small is a relative term, but we use it to show size. • There is a limit to how we can use it in science.

  3. II. Nature of Light A. Wave Nature of light Light is electromagnetic radiation. A type of energy embodies in oscillating electric and magnetic fields

  4. A. Wave Nature of Light • An EM wave can be characterized by its amplitude and wavelength.

  5. A. Nature of Light • All waves are also characterized by frequency (n)

  6. B. The EM Spectrum • The EM Spectrum is made of several different wavelengths

  7. C. Interference and Diffraction • Waves (including EM waves) interact with each other in a characteristic way called interference

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  9. D. Particle Nature of Light • In the early 1900s light was believed to be wave only, but then the photoelectric effect was discovered.

  10. Example • A DVD player uses a laser that emits light at 685nm. What is the energy of 1 mole of photons of this light?

  11. III. Atomic Spectroscopy and the Bohr Model • The dual nature of light led scientists to think about how light acts as both a particle and as a wave. • Atomic Spectroscopy was developed to explore the phenomenon.

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  13. III. Atomic Spectroscopy and the Bohr Model • The idea that each element has discreet lines required scientists, like Neils Bohr, to develop a new model for the atom.

  14. IV. Wave Nature • It has been shown that the wave nature of an electron is an inherent property of an individual electron. • deBroglie Wavelength • An electron traveling through space has a wave nature.

  15. Example • Calculate the wavelength in nm of an electron with speed 4.57 x 106 m/s

  16. B. Uncertainty Principle • Experiments have shown that we can never see the interference pattern and simultaneously determine which hole the electron goes through to make it.

  17. C. Indeterminacy • Macroscopic objects have their velocity and position known : determined. • Electrons do not (Uncertainty Principle): indeterminacy

  18. V. Quantum Mechanics and the Atom • Many properties of an element is dependent on the energy of electrons which is related to the velocity which we have shown to be indeterminate. • Schrodinger Equation • The wave function ψ is away to describe energy of electrons and the probability of finding an electron in a volume of space.

  19. 1. Principle Quantum Number (n) • The integer that determines overall size and energy of an orbital.

  20. 2. Angular Momentum Quantum Number (l) • This number determines the shape of the orbital.

  21. 2. Angular Momentum Quantum Number (l)

  22. 3. Magnetic Quantum Number (ml) • This number tells us the orientation of the orbital

  23. ml = -1 ml = 0 ml = 1 ml = -2 ml = -1 ml = 0 ml = 1 ml = 2

  24. 4. Magnetic Spin Number (ms) • The spin of the electron in the orbital

  25. Examples • How many 2p orbitals are there in an atom? • How many electrons can be placed in the 3d sublevel?

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