Chem 161 Chapter 9 Molecular Geometry Worksheet - Shape Determines Function Page 35
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40c. Calculate the bond order for the He
molecule.
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d. Using the bond order determined for the He
molecule, explain why it is not stable.
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MOLECULAR ORBITALS IN HOMONUCLEAR DIATOMIC MOLECULES
Consider when two sets of p orbitals come together and overlap to form
and
bonds.
σ
π
*
2p
atomic orbitals
2 new molecular orbitals: bonding
and antibonding
σ
σ
→
x
2p
2p
– Because the lower MO results from direct overlap, it is called a bonding
σ
MO.
2p
– A bonding MO is lower in energy than the original atomic orbitals.
*
– A node between the nuclei in the upper MO results in an antibonding
MO.
σ
2p
– An antibonding MO is higher in energy than the original atomic orbitals.
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