Drawing MO Diagrams

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Marc Farah 3D
Posts: 22
Joined: Wed Sep 21, 2016 2:59 pm

Drawing MO Diagrams

Postby Marc Farah 3D » Thu Nov 10, 2016 4:09 pm

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?

Jared Faith 4E
Posts: 10
Joined: Wed Sep 21, 2016 2:57 pm

Re: Drawing MO Diagrams

Postby Jared Faith 4E » Thu Nov 10, 2016 4:18 pm

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)

Posts: 19
Joined: Wed Sep 21, 2016 2:58 pm

Re: Drawing MO Diagrams

Postby Alyssa_Wieand_2G » Thu Nov 10, 2016 8:06 pm

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.

Ashley Bertholf 1E
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

Re: Drawing MO Diagrams

Postby Ashley Bertholf 1E » Fri Nov 11, 2016 9:03 am

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?

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