Quark model

The quark model is a way scientists understand the fundamental building blocks of matter. It explains that protons and neutrons, which make up atomic nuclei, are composed of smaller particles called quarks. There are six types, or "flavors," of quarks, but protons and neutrons are made specifically of up and down quarks. Quarks are never found alone; they always combine in specific ways, held together by the strong force. This model helps us understand the structure of matter at the smallest scales and the forces that govern subatomic particles.