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Electron configuration

  1. Oct 2, 2013 #1
    1. The problem statement, all variables and given/known data

    For Sg+2 what is the electron configuration.

    3. The attempt at a solution

    My immediate response would be [Rn] 7s2, 5f14, 6d2
    but the answer is [Rn] is 5f14 6d4

    Can someone explain this to me?
  2. jcsd
  3. Oct 2, 2013 #2


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    If the answer is correct, this means the math works out that the 7s-shell valance orbitals are at an actually higher energy than the 6d or 5f orbitals. I think this might be the answer, but I'm not familiar enough with calculations to say for sure.
  4. Oct 2, 2013 #3


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    Staff: Mentor

    Per analogy with transition metals I would expect 7s electrons to be lost first. Why makes you think it should be 6d?
  5. Oct 2, 2013 #4
    I suppose I dont fully understand electron orbitals concept. Upon a little more brain digging, we remove heighest energy level electrons first?
  6. Oct 3, 2013 #5


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    Yes, the electrons in an atom in its ground state are arranged in the orbitals from lowest energy to highest. If the 7s orbitals happen to be at a higher energy than the 6d or 5f orbitals, then the 6d and 5f orbitals would fill up before the 6s orbital fills up.
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