Compare the bonding n2 and o2 in the light of molecular orbital theory
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Why is the σσ-MO formed by the pp AOs energetically above the ππ-MO for N2NX2 but not for O2OX2?
Can it be explained this way:
In second period elements with more than a half filled pporbitals, the energy pattern of the MOs is regular.
In second period elements with less than or half filled pporbitals, as the ss and pp atomic orbitals have similar energies, so the formed σgσXg MO would have similar energy as σuσXu, but because of electron cloud repulsion it has a big increase in energy, hence it is above the ππorbitals? And this phenomenom is known as sp mixing.
Or am I wrong somewhere? Is my reasoning corret?
Can it be explained this way:
In second period elements with more than a half filled pporbitals, the energy pattern of the MOs is regular.
In second period elements with less than or half filled pporbitals, as the ss and pp atomic orbitals have similar energies, so the formed σgσXg MO would have similar energy as σuσXu, but because of electron cloud repulsion it has a big increase in energy, hence it is above the ππorbitals? And this phenomenom is known as sp mixing.
Or am I wrong somewhere? Is my reasoning corret?
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