General Caption: Two versions of the standard atom symbol ⚛:
What do real atoms and nuclei look like?
Electrons are thought to be point particles that as dictated by quantum mechanics exist in a superposition of positions, and so effectively form a fuzzy cloud around the nucleus with NO sharp edge. In fact, atoms in actual images look like fuzzy balls because they are, in fact, fuzzy balls. For a real image of atoms, see file atom_gold.html.
Nucleons are nearly point particles: each is thought to be made of 3 quarks. But for most purposes they are effectively point particles that as dictated by quantum mechanics exist in a superposition of positions, and so form a fuzzy cloud (with no sharp edge) at the center of the fuzzy cloud formed by the electrons.