W2013CHM2311 Part 4a Notes

When electrons are added to mos of the same energy

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Unformatted text preview: n H2 is formed. Energy ψ*MO = ϕ1sA  ­ ϕ1sB ΔE ϕ1sA ϕ1sB ψMO = ϕ1sA + ϕ1sB Molecular Orbital Theory Requirement for Bonding Bonding will only occur if the overall energy of electrons in the molecule is lower than the overall energy of electrons in the isolated atoms – i.e., the molecule must be more stable than the isolated atoms. MO Diagram for He2 Use a simple MO diagram to determine whether two He atoms will combine to form He2 Each He atom ini0ally has two electrons in its 1s orbital. Energy σ* He1s He1s σ H e2 Will bonding between two He atoms occur? MO Diagram for He2 Use a simple MO diagram to determine whether two He atoms will combine to form He2 He2 therefore contains four electrons. Energy σ* He1s He1s σ H e2 Bond Order Bond order tells us the number of bonds between two atoms. 1 Ⱥȹ number of electrons ȹ ȹ number of electrons ȹȺ bond order = Ⱥȹ ȹ − ȹ...
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This note was uploaded on 03/28/2014 for the course CHM 2311 taught by Professor Richardson during the Winter '09 term at University of Ottawa.

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