This is to be done in spartan which I do not have. Thank you.

16. Determine charges at carbons a and b above. 17. Draw a resonance structure for the above molecule to account for the separation of charge. The structure should have negative charge on a or b and positive charge on a or b and will affect the aromaticity of both rings. 18. Setup an electronic distribution diagram by selecting "setup-surfaces" and clicking on electrostatic potential map. Submit the calculation. 19. After the calculation is complete, select "display-surfaces" and check the box for electrostatic potential map. 20. Insert a picture of the surface map. 21. Describe the map and explain the differences in charge between the two rings. (red = negative, blue =positive)