MO Theory

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Luke_Lucido_3B
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Joined: Wed Sep 21, 2016 2:58 pm

MO Theory

Postby Luke_Lucido_3B » Fri Nov 04, 2016 11:40 am

Why do bonding molecular orbitals have lower energy than anti bonding molecular orbitals? seems like it should be the opposite to me

Pauline Tze 3B
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Re: MO Theory

Postby Pauline Tze 3B » Fri Nov 04, 2016 12:31 pm

Luke_Lucido_3B wrote:Why do bonding molecular orbitals have lower energy than anti bonding molecular orbitals? seems like it should be the opposite to me


Bonding and anti-bonding molecular orbitals are necessary to ensure the conservation of energy of orbitals. Bonding orbitals act to make the atomic orbitals overlap into a molecule while anti bonding orbitals act to force the atomic orbitals apart.
Anti-bonding molecular orbitals are higher in energy because they represent the instability of the molecule; in other words, to be stable, molecular orbitals need to achieve the lowest possible energy state (and therefore bonding orbitals are lower in energy).

I hope that helps!


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