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1. Draw the Lewis structure for ethylene, C₂H₄.

   Solution to problem 1

   

2. Draw the Lewis structure for nitric acid, HNO₃. Include formal charges and resonance structures.

   Solution to problem 2

   

3. Draw the Lewis structure for perchlorate, ClO₄^-. How many resonance resonance structures exist for this ion?

   Solution to problem 3

   

4. Draw the Lewis structure for cyanate, CNO^-.

   Solution to problem 4