The University of Kentucky has developed an awesome tool for making the periodic table of elements fun. The Periodic Table of Comic Books allows users to click an element and discover comics that talk about it, while also reading analyses of how scientifically accurate those comics are.
It's still a work in progress, so there aren't yet entries for say, meitnerium or astatine, but there are a surprising number of references for elements like hafnium and lutetium in addition to expected ones like oxygen, nitrogen, and - of course - krypton. As an example, below is Scrooge McDuck talking about lithium, but there are also fun examples of Jimmy Olsen looking for germanium and the Beyonder turning an office building into gold. A fun, educational way to kill some time.