As I understand, the heaviest bonded element found in space to date is iodine, in the form of iodide in sodium iodide. This is the only element heavier than iron on this list, and that makes sense to me because the nuclear fusion inside stars only continues until iron. The only way that heavier elements are formed is when a star is near death and the energy is so high in the center of the star that more nuclear fusion occurs, and then the elements are flung into space.
If this is true, then wherever they found the sodium iodide should be traces of more heavier-than-iron elements. Why then hasn't an element such as, say, bromine been found? Especially when it behaves so similarly to iodine.
This had stumped me for a while and information on the topic is sparse, so I'd just like some input on if it may be a limitation on observation of space or an astrochemical scenario where somehow iodine is more likely to form bonds in space than its heavier-than-iron counterparts