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Homework Help: Electron configuration

  1. Feb 16, 2009 #1
    1. The problem statement, all variables and given/known data

    Electron configuration 1s^2 2s^2 2p^6 3s^1

    2. Relevant equations

    How do i determine this from a periodic table

    3. The attempt at a solution
    i know the one in front of the S is the number of orbitals and the S signifies the group in the periodic table
     
  2. jcsd
  3. Feb 16, 2009 #2
    Well, we know that neutral atoms have the same number of protons and electrons.

    The 1s^2 means there are two elections in the 1s shell which is in the first energy level. Similiarly the 2p^6 means there are 6 electrons in the 2p shell which is in the 2nd energy level. Just count the electrons.

    To make sure you understand the concept of orbitals, I suggest you work some problems like this backwards. Such as trying to see if you can find the electronic structure of Sodium without any help, pick an element! I dunno if you have learned about D orbitals, if not stay above the 4th row.
     
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