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Homework Help: Electron Configurations in excited states

  1. Oct 16, 2007 #1
    1. The problem statement, all variables and given/known data
    Which of the following electron configurations correspond to an excited state? Identify the atoms and write the ground-state electron configuration where appropriate.

    1s2 2s2 2p4 3s1
    [Ar]4s2 3d5 4p1

    2. Relevant equations

    3. The attempt at a solution
    I have no idea what to do. I was able to get 1s2 2s2 3p1 is boron but that is only because I thought it said 1s2 2s2 2p1
  2. jcsd
  3. Oct 16, 2007 #2
    put the last electron back into the previous orbital, - this will give you the ground state. count the total number of electrons, check the periodic table and this will give you the element
  4. Jul 4, 2009 #3
    well, none of those..

    ==ground state includes the sub-orbitals of "p", which are: Px,Py,Pz (Well, x,y,and z are supposed to be subscripts and p is in lowercase.)

    ==it should be:
    [Ar] 4s2 3d5 4p1 = 1s2 2s2 2p6 3s2 3p6 4s2 3d5 4p1
    ==1s2 2s2 2p6 3s2 3p6 4s2 3d5 4px1 4py 4pz

    ==excited state is more elaborate...

    ==there...that's it dude..
    ==well, i suppose you know what's the correct answer,,,
    ==you've posted a trivia..
  5. Jul 5, 2009 #4


    User Avatar

    Staff: Mentor

    Count the electrons - that will give you total number of electrons and you will know what element you see.

    Write - using Aufbau principle - ground state configuration.

    Compare - if it is different, you are excited :smile:
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