Ions and Molecular Orbital Theory

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Nick_Ida 1D
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Joined: Sat Jul 09, 2016 3:00 am

Ions and Molecular Orbital Theory

Postby Nick_Ida 1D » Sun Nov 20, 2016 10:31 am

When we are given a negatively charged ion like O2- or BO-, where are we expected to put the extra valence electron? Is it on the more electronegative atom? And in the case of O2-, does it matter where we put it in the 2p orbital of the molecular orbital diagram?

Megan Yabumoto 3K
Posts: 42
Joined: Fri Jul 22, 2016 3:00 am

Re: Ions and Molecular Orbital Theory

Postby Megan Yabumoto 3K » Sun Nov 20, 2016 1:06 pm

When looking to place an extra valence electron for an ion, you need to look at the orbitals of both atoms and determine what is more favorable. In most cases it is on the more electronegative atom, but you can also take into account Hund's rule and Pauli's exclusion principle. For O2- it doesn't really matter because we use MO mainly to look at the anti-bonding and bonding orbitals and diatomic atoms' electrons combine to demarcate those orbitals anyways.

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