How do you tell which end of a polar bond is positive or negative? My book says that a molecule such as Hf has a center of positive charge a center of negative charge. But in S--O, how do you tell which end is positive, and which is negative.

Answer 1

O attracts electrons from S. Why? which is more electronegative?

Answer 2

You can look up a electronegativity chart on the internet somewhere, should be easy to find. If you have a chemistry book, should be in there as well. O is a more electronegative element than S, so it will have the negative pole.