# Molecular orbitals sigma and pi

1. Apr 17, 2014

### pamelmf

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. Apr 17, 2014

### pamelmf

The elecronic configuration is
$$1\sigma^2_{g}1\sigma^2_{u}2\sigma^2_{g}2\sigma^2_{u}1\pi^4_{u}3\sigma^2_{g}1\pi^2_{g}$$

3. Apr 17, 2014

### DrDu

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.

4. Apr 18, 2014

### pamelmf

Hey thank u very much i havent look at the orbital pictures and this topic wasnt explained at class, thanks