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Molecular orbitals sigma and pi

  1. Apr 17, 2014 #1
    hi! i have a doubt, how can i know the total number of bonding and antibonding electrons given a diatomic molecule's electronic configuration in therms of sigma and pi orbitals?

    I have to add these σ and π orbitals are of the type gerade and ungerade. does anyone can help me?
     
  2. jcsd
  3. Apr 17, 2014 #2
    The elecronic configuration is
    $$1\sigma^2_{g}1\sigma^2_{u}2\sigma^2_{g}2\sigma^2_{u}1\pi^4_{u}3\sigma^2_{g}1\pi^2_{g}$$
     
  4. Apr 17, 2014 #3

    DrDu

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    Science Advisor

    If you look at pictures of bonding and antibonding sigma and pi orbitals then it is immediately clear from inversion symmetry that bonding sigma orbitals are g and bonding pi orbitals are u, while antibonding sigma are u and antibonding pi are g. Hence you can easily count the number of bonding and antibonding orbitals.
     
  5. Apr 18, 2014 #4
    Hey thank u very much i havent look at the orbital pictures and this topic wasnt explained at class, thanks
     
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