I'm doing a lab on electrostatics, and I need to develop an electrostatic series. I've established a small sheet of plastic (20") as my reference material for determining charges. In my lab, it was given, that rubbing plastic in wool would give the plastic a negative charge meaning it is more electronegative than wool. So, so far my series looks like this: Wool Plastic (more electropositive substances at the top - more electronengative substances at the bottom) Then I rubbed a balloon in wool and moved it close to the reference material, plastic, and they repelled. This obviously shows that they have like charges. Therefore, the balloon has a negative charge like that plastic which makes it more electronegative than the wool. But now how do I determine which substance is more electronegative of the two, the balloon or the plastic? So the series is something like this now, Wool Plastic - Balloon I'm not sure how to order the plastic and the balloon, all I know is that they are both more electronegative than wool. Is there any way of determining this? thanks a lot.