MO diagrams and Bond order  [ENDORSED]

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Katrina_Domingo_3G
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Joined: Wed Sep 21, 2016 2:59 pm

MO diagrams and Bond order

Postby Katrina_Domingo_3G » Wed Nov 09, 2016 7:32 pm

To calculate the bond order of a molecule, do we always have to draw the molecular orbital diagram or is there a simpler way to calculate it?? Thank you!

Adriana Muro 1A
Posts: 10
Joined: Fri Jul 22, 2016 3:00 am

Re: MO diagrams and Bond order

Postby Adriana Muro 1A » Wed Nov 09, 2016 9:29 pm

you don't have to do MO necessarily, i think if you draw the lewis structure it should work the same to calculate bond order

Pauline Tze 3B
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Re: MO diagrams and Bond order  [ENDORSED]

Postby Pauline Tze 3B » Wed Nov 09, 2016 10:33 pm

I highly recommend calculating bond order primarily through MO diagram. If you do lewis structure, you'll miss it if the bond order is not a whole number (like 0.5 or 2.5). This is because the bond order equation specifically asks for 1/2( # bonding orbitals + # anti-bonding orbitals) and you can't account for anti-bonding orbitals with merely a lewis structure.

However, if you do want a shortcut, I find that If you practice the molecular electron configuration enough times, you can remember the order of sigma and pi bonds for both versions of the MO diagram (z<8 and z=>8) and calculate bond order for any molecule that way.

Hope that helps!


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