Electron Config. for Sg+2: Explained

  • #1
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Homework Statement



For Sg+2 what is the electron configuration.


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?
 
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  • #2
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.
 
  • #3
Per analogy with transition metals I would expect 7s electrons to be lost first. Why makes you think it should be 6d?
 
  • #4
I suppose I don't fully understand electron orbitals concept. Upon a little more brain digging, we remove heighest energy level electrons first?
 
  • #5
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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