Question:
how will we know when to pair the electrons in valence bond theory
Answer:
Valence bond structures are similar to Lewis structures, except where a single Lewis structure is insufficient, several valence bond structures can be used. It is in this aspect of valence bond theory that we see the concept of resonance. Thus, it depends on the presence and position of lone pair of electrons.
Thus, for all electrons which are not lone pairs will be paired.
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