The nature of what happens inside a black hole is still an active topic of scientific research and is not yet fully understood. Our current understanding of physics breaks down at the extreme conditions found within a black hole, where the gravitational forces are incredibly strong.
According to our current understanding of particle physics, quarks are fundamental particles that make up protons and neutrons, which in turn form the nuclei of atoms. Inside a black hole, the gravitational forces are so intense that they cause a phenomenon called gravitational singularity, where matter is compressed to an infinitely small and dense point.
It is believed that once matter crosses the event horizon—the boundary beyond which nothing can escape a black hole—our current understanding of physics no longer applies. The extreme gravitational forces inside a black hole are predicted to cause the complete collapse of matter, leading to the formation of a singularity at the center. At this point, our understanding of physics, including the behavior of quarks and atoms, breaks down.
Therefore, it is difficult to say with certainty what happens to atoms and their constituent particles, such as quarks, inside a black hole. Our current theories and models cannot accurately describe the physics within a black hole's singularity. The study of black holes, particularly the physics within their event horizons, remains an active area of research, and future breakthroughs may provide us with a better understanding of these extreme environments.