The Periodic Table of Comic Book Elements
Ender, Duke_of_URL brought this Periodic Table of Elements to our attention. Of course adamantium is missing, and chemical X doesn't belong in a table of the elements of the comic book universe, it's mostly a collection of golden age and later comics. Modern comics are sorely underrepresented, unfortunately.
...this table is an index of comic-book references to real elements, not the other way around (thus adamantidium and chemical X are out, anyway), so instead I'll nitpick at an even geekier level...
- The PowerPuff girls are well-represented in comics - I own several issues, one of the latest of which includes a gallery of PPG images rendered by comic "names", such as John Byrne and Mike Mignola. So these books are certainly accepted as part of the comics "mainstream" (if such a thing exists), vs. an purely-for-marketing-purposes book assembled by anonymous hacks.
- lack of modern comics? the point wasn't to find every mention of a given element in every comic ever published - that would be a ridiculous task. this is an overview... with the most popular "elements" getting a wider cross-section of comics. Furthermore, older comics tended to try to include more science factoids in their pseudo-science (as the space-race made science genuinely relevant to pop culture) and referenced real elements more often.
OK, I'll shut up now.