Resonance is a phenomenon that happens when a molecule can exist in a number of Lewis constructions that differ solely within the placement of electrons. A resonance hybrid is a illustration of the molecule that could be a weighted common of the entire attainable Lewis constructions. To attract a resonance hybrid, you first want to attract the entire attainable Lewis constructions for the molecule. Then, you have to decide the relative contribution of every Lewis construction to the resonance hybrid. The relative contribution of a Lewis construction is decided by its power. The decrease the power of a Lewis construction, the higher its contribution to the resonance hybrid.
Resonance is a crucial idea in chemistry as a result of it may possibly assist to elucidate a wide range of molecular properties, corresponding to bond lengths and bond angles. For instance, the benzene molecule is a resonance hybrid of two Kekule constructions. The 2 Kekule constructions have totally different bond lengths and bond angles, however the resonance hybrid has a median bond size and bond angle that’s intermediate between the 2 Kekule constructions.
