HW Problem 4.59.A

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Kymiah_Charles_2I
Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

HW Problem 4.59.A

Postby Kymiah_Charles_2I » Fri Nov 11, 2016 10:25 am

Hi!

So I'm working on HW Problem 4.59.A:
"Write the valence-shell electron configurations and bond order of B2..."
So I wrote out my configuration and it's incorrect because if you look at the molecular orbital diagram for B2, the pi and sigma orbitals of 2p switch.

B2.gif
Molecular Orbital Diagram of B2
B2.gif (11.07 KiB) Viewed 289 times

Why? I thought this only occurred with heteronuclear diatomic molecules.\
Please Help.
Thanks In Advance!

Jessie_Chen_2L
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Re: HW Problem 4.59.A

Postby Jessie_Chen_2L » Fri Nov 11, 2016 11:20 am

For all atoms with an atomic number less than 8 (so anything before oxygen), the pi orbital is more stable because it has less energy than the sigma orbitals for 2p, so they fill up first. For all atoms with an atomic number greater than or equal to 8, the sigma orbital fills up before the pi orbital.


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