Science Delta Year

Week one I was trying to introduce the concept of an atom, which drew a lot of blank looks. When week two rolled around and I was explaining elements, still more vacant expressions. I need visuals, but how do you show an atom and microscopic molecules to your kids? So tonight I'm up looking for videos.
What is an Atom, is short but feels long because it's kind of boring.
Atoms, Bill Nye's presentation is much more interesting though full of many distracting antics. Yeah, that ought to do it.