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Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory
Tro - Chemistry: A Molecular Approach 5th Edition
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Tutti i libri di testoTro 5th EditionCh.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO TheoryProblema 75a
Capitolo 11, Problema 75a

Using the molecular orbital energy ordering for second-row homonuclear diatomic molecules in which the π2p orbitals lie at lower energy than the σ2p, draw MO energy diagrams and predict the bond order in a molecule or ion with each number of total valence electrons. Will the molecule or ion be diamagnetic or paramagnetic? a. 4 b. 6

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1
Identify the second-row homonuclear diatomic molecule with 4 valence electrons. This could be a hypothetical molecule like Be2.
Construct the molecular orbital (MO) diagram for the molecule. For second-row diatomic molecules, the order of orbitals is: \( \sigma_{1s} \), \( \sigma^*_{1s} \), \( \sigma_{2s} \), \( \sigma^*_{2s} \), \( \pi_{2p} \), \( \sigma_{2p} \), \( \pi^*_{2p} \), \( \sigma^*_{2p} \).
Fill the molecular orbitals with the 4 valence electrons, starting from the lowest energy orbital. The electrons will fill the \( \sigma_{2s} \) and \( \sigma^*_{2s} \) orbitals.
Calculate the bond order using the formula: \( \text{Bond Order} = \frac{(\text{Number of bonding electrons} - \text{Number of antibonding electrons})}{2} \).
Determine if the molecule is diamagnetic or paramagnetic. A molecule is diamagnetic if all electrons are paired and paramagnetic if there are unpaired electrons.

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Molecular Orbital Theory

Molecular Orbital Theory describes how atomic orbitals combine to form molecular orbitals, which can be occupied by electrons. In this theory, electrons are delocalized over the entire molecule, and the energy levels of these molecular orbitals determine the stability and properties of the molecule. Understanding the energy ordering of these orbitals is crucial for predicting bond order and magnetic properties.
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Bond Order

Bond order is a measure of the number of chemical bonds between a pair of atoms, calculated as the difference between the number of bonding and antibonding electrons divided by two. A higher bond order indicates a stronger bond and greater stability of the molecule. For example, a bond order of 1 corresponds to a single bond, while a bond order of 2 corresponds to a double bond.
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Diamagnetism and Paramagnetism

Diamagnetism and paramagnetism are terms used to describe the magnetic properties of substances based on their electron configurations. Diamagnetic substances have all paired electrons and are weakly repelled by a magnetic field, while paramagnetic substances have unpaired electrons and are attracted to a magnetic field. The presence of unpaired electrons in the molecular orbitals determines whether a molecule is diamagnetic or paramagnetic.
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