The chalcogens get smellier as you go down down the periodic table: oxygen, sulfur, selenium, tellurium.
Tell a fictional story of the Marie and Pierre Curie being the first mortals to smell a polonium compound (organopolonide), then, as they vomit for (say) months due to the odor, regretting every decision they've ever made in life, especially taking up chemistry. "You think it's a chacogen? (retch)" "Yeah, I'm pretty sure it's a chalcogen. (retch)"
In reality, smelling polonium would have killed them due to its intense radioactivity.