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The Quantum Mechanical Model

Explore the quantized energy levels, electron positions, and probabilistic nature of the quantum mechanical model. Learn about the empty space in atoms, subatomic particles, and the minuscule size of atomic nuclei.

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The Quantum Mechanical Model

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  1. The Quantum Mechanical Model • Energy is quantized. It comes in chunks. • A quanta is the amount of energy needed to move from one energy level to another. • Since the energy of an atom is never “in between” there must be a quantum leap in energy. • Erwin Schrodinger derived an equation that described the energy and position of the electrons in an atom

  2. The Quantum Mechanical Model • The quantum mechanical model is a mathematical solution • It is not like anything you can see.

  3. The Quantum Mechanical Model • Has energy levels for electrons. • Orbits are not circular. • It can only tell us the probability of finding an electron a certain distance from the nucleus.

  4. QM model - Modern View • The atom is mostly empty space • Two regions 1. Nucleus- protons and neutrons 2. Electron cloud- region where you might find an electron

  5. Other particles • Proton - positively charged pieces 1840 times heavier than the electron – by E. Goldstein • Neutron - no charge but the same mass as a proton – by J. Chadwick

  6. Subatomic particles Actual mass (g) Relative mass Name Symbol Charge Electron e- -1 1 9.11 x 10-28 Proton p+ +1 1840 1.67 x 10-24 Neutron n0 0 1840 1.67 x 10-24

  7. Size of an atom Nucleus tiny compared to atom If the atom was the size of a football stadium, the nucleus would be the size of a marble.

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