Lecture_9_Atomic_models - Models of the Atom The Bohr Model...

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Models of the Atom The Bohr Model of the Atom A. Electron Orbits, or Energy Levels 1. Electrons can circle the nucleus only in allowed paths or orbits 2. The energy of the electron is greater when it is in orbits farther from the nucleus 3. The atom achieves the ground state when atoms occupy the closest possible positions around the nucleus 4. Electromagnetic radiation is emitted when electrons move closer to the nucleus B. Energy transitions 1. Energies of atoms are fixed and definite quantities 2. Energy transitions occur in jumps of discrete amounts of energy 3. Electrons only lose energy when they move to a lower energy state C. Shortcomings of the Bohr Model 1. Doesn't work for atoms larger than hydrogen (more than one electron) 2. Doesn't explain chemical behavior The Quantum Mechanical Model A. Probability and the Electron 1. The position and direction of motion of the electron cannot be simultaneously determined Translated : “The more certain I am about where it is, the less certain I can be about where it is going. The more certain I am about where it is going, the less certain I can be about where it is.” B.
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