# Week 1 – Focus on Resonance Worksheet Many molecules and ions have electrons that are delocalized

Section #:________(10pts)Week 1 – Focus on Resonance WorksheetMany molecules and ions have electrons that are delocalized (shared) among multiple atoms. The hybrid of all legitimateLewis Structures gives us a more accurate picture of the electronic environment. This is important because it will affectreactivity in future chapters.To draw resonance forms:1) Attach all the atoms with sigma bonds to create the skeleton of the structure using pen. You may not move atoms break sigma bonds or change the total number of electrons for resonance.2) Use pencil to add in remaining electrons needed to create the first valid Lewis Structure.3) There are three possible electron movements for resonance:a) Push 2 electrons toward an adjacent bond but don’t exceed an octet on any atom. Push electrons toward apositive charge and away from a negative charge.orb) When there is a double/triple bond you can move the pi electrons to the more electronegative atom.c) Bring two electrons from a lone pair down to form a bond pair but do not exceed the octet on any atom.Q1) Complete the set of resonance structures for the following cation and show the electron movement arrows neededto produce the other resonance structure (the sigma bond skeleton is already given).Q2) Why is the following not a valid resonance form for the cation in Q1?Q3) Complete the set of resonance structures for the following anion and show the electron movement arrows neededto produce the other resonance structure (the sigma bond skeleton is already given).Q4) Why is the following not a valid resonance form for the anion in Q3? Q5) Complete the set of resonance structures for the following molecule of ozone and show the electron movementarrows needed to produce the other resonance structure (the sigma bond skeleton is already given).Q6) Are the following resonance structures of the same molecule? How can you tell? Can you draw electron arrows toget you from one structure to the next?Q7) Are the following resonance structures of the same molecule? How can you tell? Can you draw electron arrows toget you from one structure to the next?Q8) Which of these following arrow pushing electron movements are illegal? Why?Q9) Draw the important resonance contributors for the following structures and the electron arrows needed to movethe electrons from one to the next. Remember it is a good idea to draw the skeletons in pen and move electrons inpencil to avoid mistakes. Can you identify the major contributors to the resonance hybrid?a.b.c.d.

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