We start with a valid Lewis structure and then follow these general rules. Resonance, An object free to vibrate tends to do so at a specific rate called the object's natural, or resonant, frequency. There are three resonance structures SO3 (Sulfur trioxide). https://courses.lumenlearning.com/introchem/chapter/resonance These structures are called resonance structures or contributing structures. Often, they are showed with dotted lines or two+ structures with an arrow between them. https://www.khanacademy.org/.../v/resonance-and-dot-structures Resonance is a phenomenon in which an external force or a vibrating system forces another system around it to vibrate with greater amplitude at a specified frequency of operation. A resonance structure is an alternate way of drawing a Lewis dot structure for a compound. (This frequency depends on the size, shape, and composition of the object.) If you learn these and think about them when tackling different problems, you will be able to handle whatever is thrown at you. The electrons distribute themselves evenly between both configurations (probability-wise) so that what we end up is roughly an "average". Define resonance - definition When a molecule is represented by two or more hybrid tructures and that structure are different in the position of electrons not in position of atoms, then the structure is called as resonating structure and this phenomenon is called as resonance. the resonance structure with the formal charge closet to zero is the most acceptable structure. rule 1 for estimating stability of resonance structure. A resonance structure has delocalized electrons Resonance structures have two or more possible electron structures. None of the resonance structures will be the correct representation of the actual molecule; none will completely resemble the chemical and physical properties of the actual molecule. 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