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Introduction to Electronic Structure


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Today's Class

Review How do electrons "stack up" in the atom?
Pauli exclusion principle
  • A particular atomic orbital has fixed values of n, l, and m and can thus contain a maximum of TWO electrons (one of each spin).
  • Each additional electron gives the electron "cloud" of the atom a much different behavior -- That is why each element is different.
    Examine an abridged Periodic Table
    hydrogen: 1s1
    helium: 1s2
    lithium: 1s2, 2s1
    beryllium: 1s2, 2s2
    boron: 1s2, 2s2, 2p1
    carbon: 1s2, 2s2, 2p2
    nitrogen: 1s2, 2s2, 2p3
    oxygen: 1s2, 2s2, 2p4
    flourine: 1s2, 2s2, 2p5
    neon: 1s2, 2s2, 2p6
    sodium: [Ne] 3s1

    Much of chemistry depends on how "filled" the shells are:

    To continue this study, we would enter the realm of chemistry. To return to our path of trying to understand the physics of semiconductors, we must begin to bring many atoms together to form a solid.

    Group Activity

    Plot your strategy for the Reverse Internet Challenge.

    End of Class Activity

    Anonymous minute paper critiquing the exam:

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    Last updated Oct. 29, 1996.
    Copyright George Watson, Univ. of Delaware, 1996.