Homonuclear diatomic molecules valence bond VB theory

The Lewis structure for N2 shows that the N—N bond is composed of three pairs of electrons and is a triple bond (structures 1.3 and 1.4). Each N atom has one lone pair of electrons. The Lewis structures 1.5 and 1.6 for O2 indicate the presence of a double bond, with each O atom bearing two lone pairs of electrons. 

Lewis structures give the connectivity of an atom in a molecule, the bond order and the number of lone pairs and these may be used to derive structures using the valence-shell electron-pair repulsion model (see Section 1.19). 

12 Homonuclear diatomic molecules valence bond (VB) theory 

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