27. Explain the bonding and antibonding molecular orbitals.
28. Explain the poor reactivity of nitrogen in terms of MO theory.
29. Write the conditions necessary for the formation of hydrogen bond.
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27. Electrons in bonding orbitals stabilize the molecule because they are between the nuclei. They also have lower energies because they are closer to the nuclei. Antibonding orbitals place less electron density between the nuclei. The nuclear repulsions are greater, so the energy of the molecule increases.
28. Nitrogen gas is formed when two nitrogen atoms bond together. Together they form a triple bond. ... The strength of the nitrogen-nitrogen triple bond makes the N2 molecule very unreactive because it requires a huge amount of energy to break the bonds.
29. There are two requirements for hydrogen bonding. Two Requirements for Hydrogen Bonding: First molecules has hydrogen attached to a highly electronegative atom (N,O,F). Second molecule has a lone pair of electrons on a small highly electronegative atom (N,O,F).
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