Quantum Mechanical View of Atoms

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Quantum Mechanical View of Atoms
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The electron can be thought of as spread out in
space as a cloud.
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Quantum Mechanics of the Hydrogen Atom
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n principal quantum number, positive integer l
orbital quantum number, is related to the
magnitude of the angular momentum of the
electron at given n can take integer values from
0 to (n-1) ml magnetic quantum number, is
related to the direction of the electrons
angular momentum, and it can take an integer
values from l to l.
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Zeeman Effect
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Spin Quantum Number, ms
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Conceptual Example Possible States for n3
How many different states are possible for an
electron whose principal quantum number is n3?
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Selection Rule
Another prediction of quantum mechanics is that
when a photon is emitted or absorbed, transitions
can occur only between states with values of l
that differ by one unit.
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The Exclusion Principle
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No two electrons in an atom can occupy the same
quantum state.
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Complex Atoms and Periodic Table of Elements
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Conceptual Example
Which of the following electron configurations
are possible, and which forbidden ?