These were made by our reader reader Sarah Newman, an astrophysics grad student at UC Berkeley, who writes:
I recently had a Science Rules! party and made a periodic table of mini cupcakes (I omitted the transition metals, because that was way too much). Anywhere, here's a picture. The colors separate the different groups (i.e. halogens, non-metals,
noble-gases...) The cupcakes came from a nearly flourless recipe, so really dense and kind of like brownies, with a bailey's cream cheese frosting.