Black holes are not made up of atoms in the traditional sense. Atoms are composed of protons, neutrons, and electrons, held together by electromagnetic forces. In contrast, black holes are formed from the collapse of massive stars and are characterized by their incredibly high density and intense gravitational forces.
When a massive star exhausts its nuclear fuel, it undergoes a catastrophic gravitational collapse. If the star's mass is sufficiently large, the collapse continues until it reaches a point called the singularity, where matter is compressed to infinite density. The singularity is surrounded by an event horizon, which is the boundary beyond which nothing, including light, can escape the gravitational pull of the black hole.
Inside a black hole, the laws of physics, as we currently understand them, break down. It is believed that matter within a black hole is compressed to such extreme densities that it forms a region of spacetime with highly curved geometry. The exact nature of this region is not yet fully understood, and it is currently a subject of ongoing research in theoretical physics.
Therefore, black holes are not made up of atoms or any specific particles as we know them. They represent extreme gravitational phenomena where matter has collapsed beyond the point of atomic or subatomic structures.