I’m going to ask a question, and then try to clumsily answer it myself. Please correct me where I go wrong.

Question: why isn’t a single neutron dense enough to form a black hole all by itself? If some number of neutrons all clustered together achieve high enough density, then wouldn’t a single neutron be even more dense than that?

My assumption right now is that subatomic particles are less like marbles and more like a statistical cloud of positions, and therefore a single subatomic particle, while in one sense is tiny and dense, in another sense occupies a fairly large region of space. Is that a good guess?