Question

Is there an easy way to look at a species and determine resonance?

Answer 1

You just have to draw out the dot diagrams. If you can tell that there is double bonds and single bonds, then it will have resonance.

Answer 2

Yes, you need to draw the lewis dot structures as Bhaskarl says. Good work B.
You have to be able to draw two structures where the atoms are in the same place but you can move the double bonds around .