From what I remember, an atom was supposed to be the smallest possible indivisible unit of matter, Which being as that now we know that atoms are made of quarks shows that atoms have been improperly named.
Quarks seem to also be comprised of something else, possibly strings, possibly some sort of quantum something or another, so it’s entirely possible that we haven’t actually found the atom yet.
A co-worker once told me that I had the most unique metaphors they had ever heard.