Osmium and iridium share the honors, actually (in addition to always hanging out together in ores - they're total bros, really). Osmium is the most dense element in its naturally occuring isotope mixture. However, iridium has a naturally occuring, stable isotope that taken for itself is even more dense. It just isn't very common, which is why the average density natural iridium isn't as high as that of osmium.
But even then, we're talking about hair-splitting differences. The two are extremely close together. As, you know, bros do.
EDIT: Curses, foiled again!
But even then, we're talking about hair-splitting differences. The two are extremely close together. As, you know, bros do.
EDIT: Curses, foiled again!