11Covalent Bonding: OrbitalsToday’s Lecture14.2 The Molecular Orbital Model1assumes that electron pairs are localized thus the conceptof resonance must be addedonly deals with even electron molecules - does not readilyProblems with the LE Modelonly deals with even electron moleculesdoes not readilydeal with unpaired electronsoversimplified modele.g. O2sp2hybrid orbitals overlap to form theσbondbetween the two oxygen atomsOO2unhybridized p orbitals of each oxygen atom, formtheπbondresult is a double bond (i.e. 2 bonding electron pairs)PROBLEM: the oxygen molecule shows physical propertiescharacteristic of a molecule withunpaired electrons
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