Do you begin a lesson on subatomic particles with Kathleen Crawford's (1994) 'Atoms Family Album' assignment? I have recreated characters from that story and used them to address several naive conceptions students carry about calculating subatomic particles (4 of the cartoons) and Lewis dot structures (1 of the cartoons). I supply a full answer key that explains the naive conceptions behind the incorrect answers given by two of the three characters in each cartoon.
I love having students argue out their viewpoints in agreement circles after committing to an answer instead of just telling them the correct answers. These cartoons make GREAT exit slips.