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Drawing MO Diagrams

Posted: Thu Nov 10, 2016 4:09 pm
by Marc Farah 3D
When we are asked to draw the molecular orbital theory for a molecule with two different elements, I know we have to draw the orbitals for one element lower than the others but why and which one do we choose? Also what are the important ideas we have to pay attention to when we have two different elements?

Re: Drawing MO Diagrams

Posted: Thu Nov 10, 2016 4:18 pm
by Jared Faith 4E
You have to draw the more electronegative atom lower in the model because the more electronegative atom has lower energy levels. You do this when there are two different atoms (ex: oxygen and carbon). If it is two of the same atoms, they go on the same level. (ex: carbon and carbon)

Re: Drawing MO Diagrams

Posted: Thu Nov 10, 2016 8:06 pm
by Alyssa_Wieand_2G
The more electronegative atom is slightly lower when drawing MO diagrams for a heteronuclear diatomic molecule. Additionally, if one of the atoms has a nuclear charge of 8 and higher (Z>8) then the sigma bonds are lower than the pi bonds.

Re: Drawing MO Diagrams

Posted: Fri Nov 11, 2016 9:03 am
by Ashley Bertholf 1E
When drawing molecular orbitals, what do the antibonding regions actually mean ? I understand the wave functions are out of phase but conceptually how do we picture this?