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Determine the formal charge on each atom in the structure. What is the overall charge on the structure?
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Resonance occurs in the event that there exist multiple positions that are valid of a double bond within many Lewis structures. In these situations electrons are dispersed and the resulting molecule displays properties that are a combination that of resonance structures.
Formal charge of H atoms: 0
Formal charge of the B atom: -1
This is done by using the electron configuration laws. The H atom valency has been completely satisfied, while an additional pair of electrons is attached to the Batom in the form a bond.
The total charge is -1